Alpha Particle Detection System Patents (Class 250/370.02)
  • Patent number: 10483316
    Abstract: Curved, flexible arrays of radiation detectors are formed by using standard silicon semiconductor processing materials and techniques and additional functionalization through integration of conversion and shielding materials. The resulting flexible arrays can be handled, integrated, further functionalized and deployed for a wide variety of applications where conventional sensors do not provide the desired functionality, form factors and/or reliability. The arrays can be stacked and include multiple types and thicknesses of conversion layers, enabling the detector to simultaneously detect multiple radiation types, and perform complex, simultaneous functions such as energy discrimination, spectroscopy, directionality detection, and particle trajectory tracking of incident radiation.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: November 19, 2019
    Assignee: mPower Technology, Inc.
    Inventors: Murat Okandan, Markku Juhani Koskelo
  • Patent number: 10444384
    Abstract: Boron nitride nanotubes (BNNTs) with 10B combined with a scintillation gas can serve as the basis for detecting thermal neutrons by detecting light from the decay products of the thermal neutron's absorption on the 10B atoms in the BNNT Material as the resultant decay products pass through the scintillating gas. BNNTs with 11B can be utilized as a scaffold for 238U and combined with a scintillation gas as the basis for detecting fast neutrons via detecting light from the fission decay products passing through the scintillating gas. Both technologies provide high spatial and temporal resolution for the detection of thermal neutrons and fast neutrons respectively.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: October 15, 2019
    Assignee: BNNT, LLC
    Inventors: Kevin C. Jordan, R. Roy Whitney
  • Patent number: 9568621
    Abstract: Some embodiments include an imaging system. The image sensor array includes multiple image sensor sheets configured in an array grid. Each image sensor sheet of the multiple image sensor sheets can include a flexible substrate layer, and the flexible substrate layer can include a first flexible substrate side and a second flexible substrate side opposite the first flexible substrate side. Meanwhile, each image sensor sheet of the multiple sensor sheets can include multiple image sensors over the first flexible substrate side, the multiple image sensors can include multiple flat panel image detectors configured in a sheet grid, and the image sensor array can include an approximately constant pixel pitch. Other embodiments of related systems and methods are also disclosed.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: February 14, 2017
    Assignee: ARIZONA BOARD OF REGENTS, A BODY CORPORATE OF THE STATE OF ARIZONA, ACTING FOR AND ON BEHALF OF ARIZONA STATE UNIVERSITY
    Inventors: Joseph T. Smith, John Stowell
  • Patent number: 8927938
    Abstract: A device for detecting alpha-particles, like those emanating from radon. The device includes an electronic circuit (100) having a detection/conversion cell (102) with a forward biased diode (D) with its n-type layer grounded and the input of which is electrically connected to the p-type layer of the diode (D). The cell is designed to recover the charge emitted by the diode (D) and to convert this charge into a representative voltage constituting a dosage signal. The device further includes a comparison circuit (160) designed to compare the level of the dosage signal with a threshold level, and a control circuit (170) to control a protection device in response to the level of the voltage (V) exceeding the threshold value.
    Type: Grant
    Filed: May 26, 2011
    Date of Patent: January 6, 2015
    Inventor: Grégory Jean
  • Patent number: 8916829
    Abstract: A system for assaying a radionuclide includes a liquid scintillation detector, an analyzer connected to the liquid scintillation detector, and a delay circuit connected to the analyzer. A gamma detector and a multi-channel analyzer are connected to the delay circuit and the gamma detector. The multi-channel analyzer produces a signal reflective of the radionuclide in the sample. A method for assaying a radionuclide includes selecting a sample, detecting alpha or beta emissions from the sample with a liquid scintillation detector, producing a first signal reflective of the alpha or beta emissions, and delaying the first signal a predetermined time. The method further includes detecting gamma emissions from the sample, producing a second signal reflective of the gamma emissions, and combining the delayed first signal with the second signal to produce a third signal reflective of the radionuclide.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: December 23, 2014
    Assignee: Savannah River Nuclear Solutions, LLC
    Inventors: James R. Cadieux, George S. King, III, Glenn A. Fugate
  • Patent number: 8890077
    Abstract: Various embodiments of the present invention provide a method of detecting inaccessible radiation sources by measuring corresponding ions and excited molecules created by radiation, using LIDAR technology. The LIDAR system of the present invention employs a pulsed laser transmitter, a telescope receiver, and associated control and acquisition systems. Light propagates out from the laser transmitted and is directed into the volume surrounding the radioactive source, or the “ion cloud.” The ion cloud absorbs the transmitted light, which induces the non-fluorescing ions to fluoresce. Light from the ion cloud is then backscattered and the telescope receiver subsequently collects the photons from the backscattered light. The intensity of the fluorescence (determined by the photon count) is measured, which provides an indication of the number density of the ionized atoms. Algorithms can then be used to relate the measured ionization rates to the source activity.
    Type: Grant
    Filed: August 4, 2010
    Date of Patent: November 18, 2014
    Assignee: Georgia Tech Research Corporation
    Inventors: Robert L. Rosson, Bernd Kahn, Brent Wagner, David Roberts
  • Patent number: 8642969
    Abstract: This generator is equipped with a first alpha particle detector (32) for monitoring the neutrons which are emitted within a first solid angle. According to the invention it is in addition equipped with at least one second alpha particle detector (52) for monitoring the neutrons which are emitted within a second solid angle which is different from the first solid angle. The system allows an object (2) that is placed in the first solid angle to be analysed by means of one or more gamma radiation detectors (34) that are placed in the second solid angle.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: February 4, 2014
    Assignee: Societe Anonyme d'Etudes et Realisations Nucleaires
    Inventor: Philippe Le Tourneur
  • Patent number: 8642960
    Abstract: A flux detection apparatus can include a radioactive sample having a decay rate capable of changing in response to interaction with a first particle or a field, and a detector associated with the radioactive sample. The detector is responsive to a second particle or radiation formed by decay of the radioactive sample. The rate of decay of the radioactive sample can be correlated to flux of the first particle or the field. Detection of the first particle or the field can provide an early warning for an impending solar event.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: February 4, 2014
    Assignee: Purdue Research Foundation
    Inventors: Ephraim Fischbach, Jere Jenkins
  • Patent number: 8525120
    Abstract: A light emitting film is transferred to a light emitting plate serving as a transfer destination member, by a transfer method. The light emitting plate contains a first scintillator material for detecting ? ray. The light emitting film includes a protective layer, a light tight layer and a light emitting layer. The light emitting layer contains an adhesive material, and a second scintillator material added thereto for detecting ? ray. The light emitting film may be directly formed on a surface of a transparent member, a light receiving surface of a photomultiplier tube or the like by a transfer method. The light tight layer and the light emitting layer are arranged between the protective layer and the transfer destination member, and thus the light tight layer and the light emitting layer are protected physically.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: September 3, 2013
    Assignee: Hitachi Aloka Medical, Ltd.
    Inventor: Akinori Iwamoto
  • Patent number: 8519335
    Abstract: A flux detection apparatus can include a radioactive sample having a decay rate capable of changing in response to interaction with a first particle or a field, and a detector associated with the radioactive sample. The detector is responsive to a second particle or radiation formed by decay of the radioactive sample. The rate of decay of the radioactive sample can be correlated to flux of the first particle or the field. Detection of the first particle or the field can provide an early warning for an impending solar event.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: August 27, 2013
    Assignee: Purdue Research Foundation
    Inventors: Ephraim Fischbach, Jere Jenkins
  • Publication number: 20130200267
    Abstract: A system for in situ nuclear measurement of alpha radiation of an effluent and a related method. The system includes: M diamond semiconductor detectors obtained by chemical vapour deposition, or silicon semiconductor detectors covered with a diamond layer, as alpha radiation detectors, configured to be immersed in the effluent, and to measure alpha radiation emitted by the effluent, M is an integer greater than or equal to 1; P measuring channels connected to the M alpha radiation detectors, P is an integer greater than or equal to 1 and less than or equal to M, each of the P measuring channels configured to provide a value or a sum of alpha activity values from the M alpha radiation detectors to which they are connected; and, if P is greater than 1, a mechanism for adding together results from the P measuring channels.
    Type: Application
    Filed: October 7, 2011
    Publication date: August 8, 2013
    Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENE ALT
    Inventor: Nicolas Saurel
  • Patent number: 8502169
    Abstract: The invention relates to a device (1) for detecting the emission of a target particle (6) at an emission wavelength, said device comprising: a photo-detector (2, 2A, 2B) comprising a sensitive detection surface having a high optical index; wherein said target particle (6) can be positioned in the vicinity of said sensitive surface in an analysis medium (13) having a low optical index; said device being characterized in that it further comprises: a mask (3) covering said sensitive surface, said mask including at least one area (4) opaque at said emission wavelength and at least one hole (5), said hole being capable of receiving the target particle; and in that the mask includes at least one interface; 7 said device further comprising at least one groove (10, 10A, 10B) provided at said interface, each of said at least one groove surrounding each of said at least one hole.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: August 6, 2013
    Assignees: Centre National de la Recherche Scientifique-CNRS, Universite d'Aix-Marseille
    Inventors: Hervé Rigneault, Pierre-François Lenne, Jérôme Wenger, Evgueni Popov, Thomas Ebbesen
  • Publication number: 20130140466
    Abstract: A device for detecting alpha-particles, like those emanating from radon. The device includes an electronic circuit (100) having a detection/conversion cell (102) with a forward-biased diode (D) with its n-type layer grounded and the input of which is electrically connected to the p-type layer of the diode (D). The cell is designed to recover the charge emitted by the diode (D) and to convert this charge into a representative voltage constituting a dosage signal. The device further includes a comparison circuit (160) designed to compare the level of the dosage signal with a threshold level, and a control circuit (170) to control a protection device in response to the level of the voltage (V) exceeding the threshold value.
    Type: Application
    Filed: May 26, 2011
    Publication date: June 6, 2013
    Inventor: Grégory Jean
  • Patent number: 8253111
    Abstract: An imaging apparatus including a flow passage 51 formed inside a base substrate 5, an active matrix substrate 3 disposed relative to a surface of the base substrate 5, an amplifier circuit connected to the active matrix substrate, and a temperature-control heat transfer medium circulated through the flow passage 51 to remove heat generated in the amplifier circuit 4 and suppress a temperature change in a semiconductor layer 2.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: August 28, 2012
    Assignee: Shimadzu Corporation
    Inventor: Toshinori Yoshimuta
  • Patent number: 8183655
    Abstract: A radiation detector of the ?E-E type is proposed.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: May 22, 2012
    Assignee: STMicroelectronics S.r.l.
    Inventors: Giuseppe Valvo, Piero Giorgio Fallica, Stefano Agosteo, Alberto Fazzi
  • Patent number: 8143584
    Abstract: A radon monitor includes a housing defining a housing cavity and having an opening in an exterior wall that is in fluid communication with the housing cavity to allow air to diffuse into and out of the housing cavity. The monitor also includes input and output units and a circuit board that is positioned in the housing cavity and supported by the housing. A passive, non-electrically powered sampling chamber defines a chamber cavity and is coupled to the circuit board. The circuit board defines a plurality of apertures that allow air to diffuse between the housing cavity and the chamber cavity. A detector for detecting radon is supported by the circuit board and positioned in the chamber cavity.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: March 27, 2012
    Assignee: Radon Technologies, Inc.
    Inventors: Joseph P. Burke, Steven L. Finkelman, Gerald E. Cohn
  • Patent number: 7973287
    Abstract: A system and method for detection of alpha particles generated by a test material in proximity to a light atomic weight element. The system includes a neutron detector that is configured to detect a rate of generation of neutrons produced by an (alpha, n) reaction between the test material and the light atomic weight element. There is also at least one gamma-ray detector configured to measure a rate of generation of 511 keV gamma rays produced by an annihilation reaction triggered by a positron emission from a daughter product of the light atomic weight element. A comparator is configured to compare the rate of generation of neutrons and the rate of generation of 511 keV gamma rays.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: July 5, 2011
    Assignee: Nucsafe, Inc
    Inventors: Richard A. Craig, Richard S. Seymour
  • Publication number: 20110127438
    Abstract: A system for determining an amount of radiation includes a dosimeter configured to receive the amount of radiation, the dosimeter comprising a circuit having a resonant frequency, such that the resonant frequency of the circuit changes according to the amount of radiation received by the dosimeter, the dosimeter further configured to absorb RF energy at the resonant frequency of the circuit; a radio frequency (RF) transmitter configured to transmit the RF energy at the resonant frequency to the dosimeter; and a receiver configured to determine the resonant frequency of the dosimeter based on the absorbed RF energy, wherein the amount of radiation is determined based on the resonant frequency.
    Type: Application
    Filed: November 30, 2009
    Publication date: June 2, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Cyril Cabral, JR., Michael S. Gordon, Steven J. Koester, Conal E. Murray, Kenneth P. Rodbell, Stephen M. Rossnagel, Robert L. Wisnieff, Jeng-bang Yau
  • Patent number: 7875854
    Abstract: The invention relates to a design structure, and more particularly, to a design structure for an alpha particle sensor in SOI technology and a circuit thereof. The structure is a silicon-on-insulator radiation detector which includes: a charge collection node; a precharge transistor that has a source from the charge collection node, a drain at Vdd, and a gate controlled by a precharge signal; an access transistor that has a source from the charge collection node, a drain connecting to a readout node, and a gate controlled by a read-out signal; and a detector pulldown transistor having a drain from the charge collection node, a source to ground, and a grounded gate.
    Type: Grant
    Filed: April 8, 2008
    Date of Patent: January 25, 2011
    Assignee: International Business Machines Corporation
    Inventors: Ethan H. Cannon, Michael J. Hauser, Timothy D. Sullivan
  • Patent number: 7847360
    Abstract: A radiation detector of the ?E-E type is proposed.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: December 7, 2010
    Assignee: STMicroelectronics, S.r.l.
    Inventors: Giuseppina Valvo, Piero Giorgio Fallica, Stefano Agosteo, Alberto Fazzi
  • Publication number: 20100282976
    Abstract: This generator is equipped with a first alpha particle detector (32) for monitoring the neutrons which are emitted within a first solid angle. According to the invention it is in addition equipped with at least one second alpha particle detector (52) for monitoring the neutrons which are emitted within a second solid angle which is different from the first solid angle. The system allows an object (2) that is placed in the first solid angle to be analysed by means of one or more gamma radiation detectors (34) that are placed in the second solid angle.
    Type: Application
    Filed: May 4, 2010
    Publication date: November 11, 2010
    Applicant: SOC. ANONYME D'ETUDES ET REALISATIONS NUCLEAIRES
    Inventor: Philippe Le Tourneur
  • Publication number: 20100249583
    Abstract: A radiation-detecting probe instrument has a forward working portion housing a radiation detector and a rearward user directed portion, and is in communication with a control assembly for processing and outputting signals received from the radiation detector correlative to a located radionuclide source emitting energy above about 80 KeV. The disclosed probe instrument forward portion has an annular housing having a radiation transparent tip. The radiation detector is disposed behind the radiation transparent tip. A K alpha radiation emitting wafer (e.g., Pb) wafer is disposed between the radiation transparent tip and the radiation detector. A radiation resistant (e.g., W) shield is disposed between the annular housing and the radiation detector and the Pb wafer. Radiation emitted from the radionuclide source strikes the Pb wafer causing the Pb wafer to emit K alpha radiation, which strikes the radiation detector for generating signals for communication the said control assembly.
    Type: Application
    Filed: March 24, 2010
    Publication date: September 30, 2010
    Applicant: ACTIS, LTD
    Inventors: Marlin O. Thurston, Richard B. Thurston
  • Patent number: 7763860
    Abstract: The present invention provides an orofacial radiation detection device for detection of radionuclide contamination from inhalation. The device includes a face mask including a support frame and an adjustable head strap connected to the support frame. Mounted on the frame are radiation detectors in selected locations so that when being worn by a person, the detectors are located in close proximity to the orofacial region of the person including their nose and mouth. The device includes an electronic controller connected to the detectors for controlling operation of the radiation detectors. The device includes a microcomputer mounted on the support frame and electrically connected to the electronic controller for processing signals from the detectors for allowing input from an operator, performing data analysis and detection algorithms, and outputting results.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: July 27, 2010
    Assignee: University of Ontario Institute of Technology
    Inventor: Edward Joseph Waller
  • Publication number: 20090302226
    Abstract: A solid-state detector for detection of neutron and alpha particles detector and methods for manufacturing and use thereof are described. The detector has an active region formed of a polycrystalline semiconductor compound comprising a particulate semiconductor material sensitive to neutron and alpha particles radiation imbedded in a binder. The particulate semiconductor material contains at least one element sensitive to neutron and alpha particles radiation, selected from a group including 10Boron, 6Lithium, 113Cadmium, 157Gadolinium and 199Mercury. The semiconductor compound is sandwiched between an electrode assembly configured to detect the neutron and alpha particles interacting with the bulk of the active region. The binder can be either an organic polymer binder or inorganic binder. The organic polymer binder comprises at least one polymer that can be selected from the group comprising polystyrene, polypropylene, Humiseal™ and Nylon-6.
    Type: Application
    Filed: February 8, 2006
    Publication date: December 10, 2009
    Applicant: YISSUM RESEARCH DEVELOPMENT COMPANY OF THE HEBREW UNIVERSITY OF JERUSALEM
    Inventors: Michael M. Schieber, Assaf Zuck, Gad Marom
  • Publication number: 20090159807
    Abstract: The present invention provides an orofacial radiation detection device for detection of radionuclide contamination from inhalation. The device includes a face mask including a support frame and an adjustable head strap connected to the support frame. Mounted on the frame are radiation detectors in selected locations so that when being worn by a person, the detectors are located in close proximity to the orofacial region of the person including their nose and mouth. The device includes an electronic controller connected to the detectors for controlling operation of the radiation detectors. The device includes a microcomputer mounted on the support frame and electrically connected to the electronic controller for processing signals from the detectors for allowing input from an operator, performing data analysis and detection algorithms, and outputting results.
    Type: Application
    Filed: December 15, 2008
    Publication date: June 25, 2009
    Inventor: Edward Joseph Waller
  • Patent number: 7550730
    Abstract: The invention relates to a method of detecting alpha particles in SOI technology and a circuit thereof. The structure is a silicon-on-insulator radiation detector which includes: a charge collection node; a precharge transistor that has a source from the charge collection node, a drain at Vdd, and a gate controlled by a precharge signal; an access transistor that has a source from the charge collection node, a drain connecting to a readout node, and a gate controlled by a read-out signal; and a detector pulldown transistor having a drain from the charge collection node, a source to ground, and a grounded gate.
    Type: Grant
    Filed: April 8, 2008
    Date of Patent: June 23, 2009
    Assignee: International Business Machines Corporation
    Inventors: Ethan H. Cannon, Michael J. Hauser, Timothy D. Sullivan
  • Patent number: 7521682
    Abstract: Processing circuitry is provided for a high voltage operated radiation detector. An event detector utilizes a comparator configured to produce an event signal based on a leading edge threshold value. A preferred event detector does not produce another event signal until a trailing edge threshold value is satisfied. The event signal can be utilized for counting the number of particle hits and also for controlling data collection operation for a peak detect circuit and timer. The leading edge threshold value is programmable such that it can be reprogrammed by a remote computer. A digital high voltage control is preferably operable to monitor and adjust high voltage for the detector.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: April 21, 2009
    Assignee: The United States of America as represented by the National Aeronautics and Space Administration
    Inventors: Samuel D. Holland, Paul B. Delaune, Kathryn M. Turner
  • Publication number: 20090090869
    Abstract: A flux detection apparatus can include a radioactive sample having a decay rate capable of changing in response to interaction with a first particle or a field, and a detector associated with the radioactive sample. The detector is responsive to a second particle or radiation formed by decay of the radioactive sample. The rate of decay of the radioactive sample can be correlated to flux of the first particle or the field. Detection of the first particle or the field can provide an early warning for an impending solar event.
    Type: Application
    Filed: September 22, 2008
    Publication date: April 9, 2009
    Inventors: Ephraim Fischbach, Jere Jenkins
  • Publication number: 20090057565
    Abstract: A cosmic ray detector includes a cantilever with a first tip. The detector also includes a second tip and circuitry to provide a signal indicative of a distance between the first and second tips being such as would be caused by a cosmic ray interaction event.
    Type: Application
    Filed: November 7, 2007
    Publication date: March 5, 2009
    Inventor: Eric C. Hannah
  • Publication number: 20090039270
    Abstract: A method and detector for detecting particle emissions from a test sample includes positioning a detector over the test sample, wherein the detector includes a plurality of detection units, wherein each detection unit includes a first silicon detector and a barrier layer removably disposed over the first silicon detector. The method includes generating a first current signal in the silicon detector in response to receiving a first particle emitted from an atom of the test sample by the silicon detector of the first detection unit, and responsive to a recoiling daughter nuclide of the atom striking the barrier layer of the first detection unit, the recoiling daughter nuclide resulting from emission of the first particle from the atom, absorbing the recoiling daughter nuclide by the barrier layer of the first detection unit.
    Type: Application
    Filed: August 8, 2007
    Publication date: February 12, 2009
    Inventors: Cyril Cabral, JR., Michael S. Gordon, Cristina Plettner, Kenneth Parker Rodbell
  • Patent number: 7488944
    Abstract: A radiation image detector including a charge generation layer, and a detection layer including: many pixels, each having a collection electrode for collecting charges generated in the charge generation layer, a storage capacitor for storing charges collected by the collection electrode, and a TFT switch for reading out charges from the storage capacitor; many scanning lines; and many data lines. Each storage capacitor is formed between a storage capacitor electrode connected to the drain electrode of a TFT switch and the scanning line connected to a TFT switch adjacent to the TFT switch to which the drain electrode belongs, an array of the TFT switches is divided into upper and lower halves, each data line is divided into upper and lower halves, and a dummy wire is provided at the division boundary for forming a storage capacitor of a pixel disposed at the division boundary section.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: February 10, 2009
    Assignee: FUJIFILM Corporation
    Inventor: Yoshihiro Okada
  • Publication number: 20080258057
    Abstract: Some embodiments include methods for fabricating an alpha particle emitter and detector associated with an integrated circuit chip. Some embodiments include an integrated circuit chip comprising an alpha particle emitter and detector supported by a semiconductor substrate. Some embodiments include an apparatus for obtaining backscatter data from a sample utilizing an alpha particle emission and detection system supported by a semiconductor substrate. Some embodiments include methods of backscatter analysis utilizing a semiconductor substrate containing an alpha particle emitter and an alpha particle sensor.
    Type: Application
    Filed: April 18, 2007
    Publication date: October 23, 2008
    Inventors: Mark Williamson, Gurtej S. Sandhu
  • Patent number: 7411198
    Abstract: Input circuitry is provided for a high voltage operated radiation detector to receive pulses from the detector having a rise time in the range of from about one nanosecond to about ten nanoseconds. An integrator circuit, which utilizes current feedback, receives the incoming charge from the radiation detector and creates voltage by integrating across a small capacitor. The integrator utilizes an amplifier which closely follows the voltage across the capacitor to produce an integrator output pulse with a peak value which may be used to determine the energy which produced the pulse. The pulse width of the output is stretched to approximately 50 to 300 nanoseconds for use by subsequent circuits which may then use amplifiers with lower slew rates.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: August 12, 2008
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Samuel D. Holland, Paul B. Delaune, Kathryn M. Turner
  • Patent number: 7375336
    Abstract: A ZnS (Ag) scintillation detector comprises a ZnS (Ag) scintillators layer 22 which is excited by incident ?-rays and emits a scintillator light, a photomultiplier tube 16 which converts the scintillator light into an electric pulse signal, and a counting rate meter 34 which counts the obtained pulse signal. The scintillator layer has a thickness which is not less than a range of ?-rays from ?-ray emitting nuclides (natural radioactive nuclides) to be separated, which enables energy absorption of ?-rays from the ?-ray emitting nuclides to be separated to entirely occur in the scintillator layer, and which enables light shielding of the scintillator light generated in the scintillator layer by the scintillator layer itself to be neglected. A pulse height discrimination circuit 32 is further provided in a preceding stage of the counting rate meter. Thereby, the effect of the natural radioactive nuclides can be reduced and the contamination control can be efficiently and smoothly performed.
    Type: Grant
    Filed: September 29, 2005
    Date of Patent: May 20, 2008
    Assignee: Japan Nuclear Cycle Development Institute
    Inventors: Ichiro Hasegawa, Kenji Izaki, Hirohide Kobayashi, Kazuo Ino, Nobuyuki Kanazawa
  • Patent number: 7369057
    Abstract: A generator monitoring system and method includes a plurality of sensors (12) disposed within a generator enclosure (18) to sense health conditions of a generator (10) housed within the enclosure. The sensors are interconnected to provide a single communication path (14) for allowing communication with the plurality of sensors. A monitoring device (16) outside the generator enclosure receives health condition information from each of the plurality of sensors via the single communication path. A sensor may be disposed within the generator enclosure to detect particulates emitted from a monitored portion (e.g., 52) of the generator housed within the enclosure. A sensor may be disposed proximate a bus bar connection (130) of the generator to sense a health condition of the bus bar connection and generate corresponding health condition information provided to the monitoring device.
    Type: Grant
    Filed: August 4, 2005
    Date of Patent: May 6, 2008
    Assignee: Siemens Power Generation, Inc.
    Inventors: Michael Twerdochlib, David Bateman
  • Patent number: 7335890
    Abstract: An atomic particle detection assembly includes at least one atomic particle detector positioned within a first chamber having a first operating pressure. The assembly also includes at least one junction apparatus coupled to the at least one atomic particle detector. The at least one junction apparatus includes at least one wall that at least partially defines a second chamber having a second operating pressure. The second pressure is greater than the first pressure and the at least one junction apparatus facilitates maintaining a predetermined pressure difference between the first chamber and the second chamber.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: February 26, 2008
    Assignee: General Electric Company
    Inventor: Kari Utterback
  • Publication number: 20070295913
    Abstract: An atomic particle detection assembly includes at least one atomic particle detector positioned within a first chamber having a first operating pressure. The assembly also includes at least one junction apparatus coupled to the at least one atomic particle detector. The at least one junction apparatus includes at least one wall that at least partially defines a second chamber having a second operating pressure. The second pressure is greater than the first pressure and the at least one junction apparatus facilitates maintaining a predetermined pressure difference between the first chamber and the second chamber.
    Type: Application
    Filed: June 22, 2006
    Publication date: December 27, 2007
    Inventor: Kari Utterback
  • Patent number: 7259381
    Abstract: The Grunn equation: Depth = 0.046 ? ? ( V acc ) n ? is modified to accurately predict depth of electron beam penetration into a target material. A two-layer stack is formed comprising a thickness of the target material overlying a detection material exhibiting greater sensitivity to the electron beam than the target material. The target material is exposed to electron beam radiation of different energies, with the threshold energy resulting in a changed physical property of the detection material below a predetermined value marking a penetration depth corresponding to the target material thickness. Utilizing the threshold energy (Vacc), the target material thickness (Depth), and the known target material density (?), the numerical power “n” of the Grunn equation is calculated to fit experimental results. So modified, the Grunn equation accurately predicts the depth of penetration of electron beams of varying energies into the target material.
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: August 21, 2007
    Assignee: Applied Materials, Inc.
    Inventors: Josephine J. Liu, Alexandros T. Demos, Hichem M'Saad
  • Patent number: 7220968
    Abstract: A radiation detector is described which includes first circuitry having at least one operational parameter associated therewith which is operable to change in response to radiation exposure. Second circuitry is operable to detect a change in the at least one operational parameter based on a predetermined relation between the at least one operational parameter and at least one type of radiation. The second circuitry is also operable to encode detection information representative of the radiation exposure in response thereto.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: May 22, 2007
    Assignee: Integrated Magnetoelectronics Corporation
    Inventors: Robert Burger, Stephen Nuspl, Richard Spitzer, Edward Wuori, Frederick Zieber
  • Patent number: 7194360
    Abstract: A method of simply and quickly determining ?-ray releasing nuclides having long half-life without carrying out a chemical separation is provided. By inputting a data of pulses incident to an ?-ray detector in a computer, obtaining time distribution of the incident pulses by using a very short time measuring timer and plotting, and fitting the linear originated in a random event corresponding to the background and the non-linear originated in the correlated events of parent nuclides-progenies by using the least squares method, the whole generating probability P (t) from the parent nuclide to the progeny thereof is obtained. By subtracting the random events portion from the P(t), the correlated events portion is extracted. The radioactivity per unit can be obtained by dividing the extracted correlated events portion by the measured time, the amount of the supplied sample and the counting efficiency.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: March 20, 2007
    Assignee: Japan Nuclear Cycle Development Institute
    Inventors: Yasuhiro Uezu, Tetsuo Hashimoto
  • Patent number: 7161153
    Abstract: An ?-ray measuring apparatus is provided for accurately analyzing the energy of a trace of ?-rays emitted from a sample in a short time using semiconductor detectors which excel in energy resolution. The ?-ray measuring apparatus comprises an ?-ray detector including a plurality of semiconductor detectors, an adder for adding output signals from the respective semiconductor detectors, an anticoincidence counter for anticoincidently counting the output signals from the respective semiconductor detectors, and a peak analyzer for analyzing an energy distribution of the ?-rays based on an addition of the output signals from the semiconductor detectors which are not anticoincidently counted. Since the output signals from the plurality of semiconductor detectors are added to increase the area of a sample under measurement and also remove background noise, the ?-ray measuring apparatus can more accurately analyze the energy of the ?-rays while reducing a measuring time.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: January 9, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Toru Shibutani, Akihisa Kaihara
  • Patent number: 7148485
    Abstract: A low energy charged particle detector having a diode with a first layer and a top layer physically coupled to the first layer. The intersection between the first layer and the top layer defines a junction. The top layer is composed of a two-dimensional material such as a chalcogen-based material, providing an electrically passivated exposed outer surface opposite to the junction. The outer surface is exposed to receive low-energy charged particles from external sources. An appropriate control circuit is coupled to the diode, and operable to recognize the incidence of a particle upon the outer surface as a change in current or voltage potential.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: December 12, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Gary A. Gibson
  • Patent number: 7057180
    Abstract: A detector circuit and method for detecting a silicon well voltage or current to indicate an alpha particle or cosmic ray strike of the silicon well. One significant application for the detection circuit of the present invention is for the redundancy repair latches that are used in SRAMs. The redundancy repair latches are normally written once at power-up to record failed latch data and are not normally written again. If one of the latches changes states due to an SER (Soft Error Rate-such as a strike by an alpha particle or cosmic ray) event, the repair data in the redundancy latches of the SRAM would now be incorrectly mapped. The detector circuit and method monitors the latches for the occurrence of an SER event, and responsive thereto issues a reload of the repair data to the redundancy repair latches.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: June 6, 2006
    Assignee: International Business Machines Corporation
    Inventors: John A. Fifield, Paul D. Kartschoke, William A. Klaasen, Stephen V. Kosonocky, Randy W. Mann, Jeffery H. Oppold, Norman J. Rohrer
  • Patent number: 6998618
    Abstract: The present invention provides a flange-mounted condition monitor (30) that can be mounted to an access flange (21) on an access opening (20) on the housing (13) of a generator (10). The condition monitor (30) forms an integral part of the generator (10) and eliminates the need for complex systems of pipes and valves for transferring hydrogen samples from the generator (10) to the condition monitor (30). The flange-mounted condition monitor (30) provides greater sensitivity to overheat conditions, significantly reducing the risk of dangerous hydrogen leaks and eliminating costs associated with installing and maintaining a remote condition monitor and also reducing or eliminating the false alarms associated with water that collects in the piping of a remote condition monitor.
    Type: Grant
    Filed: September 24, 2003
    Date of Patent: February 14, 2006
    Assignee: Siemens Westinghouse Power Corporation
    Inventor: Michael Twerdochlib
  • Patent number: 6847040
    Abstract: A sensor arrangement and method for digital X-ray imaging. The sensor arrangement in digital X-ray imaging includes at least one sensor element which absorbs X-radiation and contains a medium, which has a relatively thin semi-conductor material structure, that converts X-ray quanta into electron-hole pairs. The surface of the element opposite to the surface receiving the X-radiation is provided with electrodes for dividing the sensor element into at least two pixel columns. Each pixel electrode is provided with detection electronics and a counter for counting the voltage or current pulses generated by the electron-hole pairs. The counters for adjacent pixel columns are connected to each other so that the counters for the pixels can be loaded from the counter for the corresponding pixel on the same row in the preceding pixel column.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: January 25, 2005
    Assignee: Planmed Oy
    Inventor: Pekka Strömmer
  • Patent number: 6828561
    Abstract: A memory array operates as an alpha particle detector. A predetermined state is stored in each memory storage location. The operating voltage of the memory array is established at a voltage where the stored values are relatively stable and not subject to change except as a result of alpha particle impingement. Impinging alpha particles are detected by the state changes they cause in the memory storage locations.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: December 7, 2004
    Assignee: Agere Systems Inc.
    Inventors: Paul Arthur Layman, Samir Chaudhry, James Gary Norman, J. Ross Thomson
  • Publication number: 20040232345
    Abstract: A device for the continuous monitoring in situ of radon concentration in ambient air, and the simultaneous measurement of working level (WL) values of the radon daughters in ambient air. The device comprises an electrical field formed of two hemispherical walls facing each other with a gap therebetween allowing ambient air to diffuse through. The area between the walls is considered a “sensitive volume”. A positively-charged photodiode is disposed in communication with the sensitive volume for the detection of alpha emissions from radon or radon progeny electrically isolated within said electrical field.
    Type: Application
    Filed: March 31, 2003
    Publication date: November 25, 2004
    Inventors: Pillalamarri Jagam, John J. Simpson
  • Patent number: 6822235
    Abstract: An environmental radioactivity monitor comprises a filter (12) through which air is caused to flow, and a detector (13) of radiation emitted from the particles trapped on the filter. The signals from the radiation detector are analyzed into a multiplicity of energy channels, for example with a multi-channel analyzer (22), the counts in at least two energy windows (W1, W2; W3, W4) being used to determine the shapes of the low-energy tails of the peaks of the naturally occurring radio-nuclides ThC′ and RaC′, so their effects can be eliminated. The shape of the ThC′ peak is used to predict and strip out the ThC peak, and the shape of the RaC′ peak is then used to predict and strip out the RaA peak, so all background effects are eliminated. Accurate measurements of air-borne radioactivity are hence possible with short counting times.
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: November 23, 2004
    Assignee: Canberra Harwell Ltd.
    Inventor: David John Ryden
  • Publication number: 20040200968
    Abstract: An &agr;-ray measuring apparatus is provided for accurately analyzing the energy of a trace of &agr;-rays emitted from a sample in a short time using semiconductor detectors which excel in energy resolution. The &agr;-ray measuring apparatus comprises an &agr;-ray detector including a plurality of semiconductor detectors, an adder for adding output signals from the respective semiconductor detectors, an anticoincidence counter for anticoincidently counting the output signals from the respective semiconductor detectors, and a peak analyzer for analyzing an energy distribution of the &agr;-rays based on an addition of the output signals from the semiconductor detectors which are not anticoincidently counted. Since the output signals from the plurality of semiconductor detectors are added to increase the area of a sample under measurement and also remove background noise, the &agr;-ray measuring apparatus can more accurately analyze the energy of the &agr;-rays while reducing a measuring time.
    Type: Application
    Filed: March 29, 2004
    Publication date: October 14, 2004
    Inventors: Toru Shibutani, Akihisa Kaihara
  • Patent number: 6774638
    Abstract: A highly sensitive charged particle measuring device capable of measuring low-level alpha rays comprises in a measurement chamber 7 provided with a sealable door 15, a test sample 2 and a semiconductor detector 1, a radiation measuring circuit 30 including a preamplifier 30c connected to the semiconductor detector 1, a linear amplifier 30d, and a pulse height analyzer 30e, a charged particle emission amount arithmetic unit 40 for performing the quantitative analysis of charged particles from its measurement, a display unit for displaying its analysis result, and further has an evacuation pipe line and a pure gas supply pipe line for performing supply and replacement of the pure gas in the measuring chamber 7.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: August 10, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyoshi Kogawa, Hiroshi Kitaguchi, Tetsuya Matsui, Akihisa Kaihara, Junichi Arita