Abstract: In an energy dispersive spectrometer wherein event (particle/photon) detection is performed by counting events spaced by greater than a shaping time, events which are spaced by less than the shaping time are also collected and counted. These “combined events” are treated similarly to “single events” which are spaced by greater than the shaping time, and can be used to generate combined-event spectra for comparison and/or use with the conventional single-event spectra. The combined-event spectra can be compared to the single-event spectra to provide an indication of data quality; can be subtracted from the single-event spectra to remove artifacts, and/or can be deconvolved into a single-event spectrum to increase the resolution of the single-event spectrum.

Abstract: A photo detector matrix may have a plurality of photo detectors arranged in a matrix each generating an output signal, and a plurality of wires coupled with the photo detectors, wherein a number of wires is less than a number of photo detectors and the plurality of photo detectors are assigned to the plurality of wires such that signals generated by the plurality of photo detectors encode a location of a light peak applied to the photo detector matrix.

Abstract: A hybrid imaging detector is for detecting ionizing radiation such as X-rays or electron radiation, or other ionizing radiation. The detector has a sensor (10) on a read-out chip (20). The sensor (10) includes a plurality of sensor material layers (12,14) of different materials stacked on top of one another, having differing radiation absorbing properties. The materials may be Si and SiGe, Si and Ge, or Si and amorphous Se, for example. The read-out chip is a photon-counting read-out chip that records a single count when it detects a pulse above a threshold.

Abstract: A method of detecting edges of a preamplifier signal including identifying a first portion of the signal wherein each part thereof has an instantaneous slope having a first polarity, identifying a second portion immediately following the first portion wherein each part thereof has an instantaneous slope having a second opposite polarity, and identifying a third portion immediately following the second portion wherein each part thereof has an instantaneous slope having the first polarity. The method further includes determining a first difference between the magnitudes associated with an end point and a beginning point of the second segment, determining a second difference between the magnitude associated with an end point of the third segment and the magnitude associated with a beginning point of the first segment, and detecting an edge if: (i) the first difference exceeds a threshold, and (ii) the second difference exceeds a fraction of the threshold.

Abstract: The object of the invention is a detector (20) of radon and its daughter products that are present in the ambient air, including in particular aerosols, characterized in that it comprises: A silicon pellet that integrates a PN junction with a deserted zone, designed to emit signals under the action of the radiation that is emitted by said radon and said daughter products, A passivation layer (22) that covers this silicon pellet and that makes it possible for the detector to work in the open air, and A conductive layer (24) that covers the passivation layer and that forms an electrode for collecting radionuclides. The invention also covers the detection device that includes said detector.

Abstract: A method of detecting a pileup in an energy-dispersive radiation spectrometry system, wherein a filter of the system generates a first pulse in response to a preamplifier signal, and wherein the system has one or more fast channels having an energy of full efficiency wherein substantially all photons received having at least the full efficiency energy are detected. The method includes measuring an above threshold time duration of the filter, determining that the fast channels have not made any detections while the first pulse is above the minimum detectable threshold energy of the filter, in response thereto, declaring a pileup if the above threshold time duration exceeds a longest expected pulse duration that is a duration of a second pulse that would be output by the filter in response to a single photon having an energy equal to the energy of full efficiency being received by the system.

Abstract: A camera sub-module is provided for providing tomographic imaging of radiation emissions generated internally by a body. The camera sub-module includes a radiation-emitting layer having a radioactive source for emitting transmission emissions, and at least one radiation-detection layer for contemporaneously detecting and permitting differentiation between the transmission emissions and emissions generated internal to an imaged body administered with a positron-emitting radiotracer. Also provided herein are imaging systems, scanners, and other apparatus and methods.

Abstract: A semiconductor wafer is radiated with an electron beam so that the inelastic scattering takes place in the narrow region, and current flows out from the narrow region; the amount of current is dependent on the substance or substances in the narrow region so that the analyst evaluates the degree of contamination on the basis of the substance or substances specified in the narrow region.

Abstract: A method of detecting pileups includes testing an instantaneous slope of a preamplifier signal against a noise trigger value and, after the instantaneous slope has been determined to exceed the noise trigger value, identifying a first subsequent portion of the preamplifier signal wherein the instantaneous slope of the preamplifier signal increases to a maximum. The method further includes, following the first subsequent portion, identifying a second subsequent portion of the preamplifier signal wherein the instantaneous slope still exceeds the noise trigger level but has decreased by more than the noise trigger level from the maximum, and, following the second subsequent portion and before the instantaneous slope declines below the noise trigger level, identifying a third subsequent portion of the preamplifier signal wherein the instantaneous slope of the preamplifier output signal increases by more than the noise trigger value, and, in response thereto, determining that a pileup has occurred.

Abstract: A photon-counting detector includes a direct conversion material and a data acquisition system with a first comparator having a first signal level threshold indicative of a noise level of a spectrum of photons, the first comparator configured to output a count when the electrical signal level exceeds the first signal level threshold, and a second comparator having a second signal level threshold indicative of the maximum energy of the spectrum of photons, the second comparator configured to output a count when the electrical signal exceeds the second signal level threshold where a photon count is determined based on the counts from the first and second comparators.

Abstract: A representation of an amount of energy incident on a radiation sensor formed from multiple sensing elements coupled together along a direction parallel to a direction of propagation of the incident radiation is received. The radiation sensor has an adjustable border positioned between any two of the multiple sensing elements. From the representation, an amount of energy incident on the radiation sensor is determined. A position of the border is selected based on the amount of energy incident on the radiation sensor. After selecting the position of the border, an absorption characteristic of a region imaged by the radiation sensor is determined.

Abstract: The invention relates to detectors for radiological imaging, and more particularly the X-ray matrix detectors, produced in the form of a CMOS technology pixel matrix, associated with a structure for converting X-rays into electrons. Each pixel comprises a reading circuit comprising on the one hand a comparator (COMP1) switching over each time a charge increment arrives resulting from the integration of a charge current generated by the lighting and on the other hand a counting circuit (CPT1, CPT2) for counting the number of switchovers of the comparator. The circuit for reading each pixel comprises a circuit (CMC) for analyzing the rate of the switchovers of the comparator, this analysis circuit acting on the counting circuit to modify its operation according to the result of the rate analysis. For example, the analysis circuit switches the counting pulses to one counter (CPT1) or another counter (CPT2) depending on the result of the analysis.

Abstract: A photodiode for detection of preferably infrared radiation capable of detecting two different wavelengths wherein photons are absorbed in one region and detected in another. In one example embodiment, an absorbing P region is abutted with an N region of lower doping such that the depletion region is substantially (preferably completely) confined to the N region. The N region is also chosen with a larger bandgap than the P region, with compositional grading of a region of the N region near the P region. This compositional grading mitigates the potential barrier between the respective bandgaps. Under first voltage conditions a potential barrier prevents minority carriers from moving from the P region to the N region, but photons of energy large enough to generate minority carriers within the N region are detected. Under reverse bias, the barrier is substantially reduced or disappears, allowing charge carriers to move from the absorbing P region into the N region (and beyond) where they are detected.

Abstract: Methods and systems for a medical imaging system are provided. The medical imaging system includes an input circuit configured to receive a voltage level signal indicative of a stream of pulses, a voltage level signal shape analyzer configured to determine shape characteristics of the received voltage level signal and an amount of time that the received voltage level signal matches a predetermined shape, and a counting circuit configured to determine a true number of pulses from the shape characteristics and the amount of time.

Abstract: An object to be imaged or detected is illuminated by a single broadband light source or multiple light sources emitting light at different wavelengths. The light is detected by a detector, which includes a light-detecting sensor covered by a hybrid filter.

Abstract: A combined format gamma-ray detector (D) for measuring impinging gamma-rays (10) includes an active upper level coded aperture detector plane member (12) that is suitable for detecting an impinging gamma-ray (10). An active lower level gamma ray detector plane member (14) that is spaced apart from the upper level coded aperture (12) detects an impinging gamma-ray (10). At low gamma-ray energies, the combined format gamma-ray detector device (D) operates as a conventional coded aperture system and at higher gamma-ray energies, the combined format gamma-ray detector device operates as a Compton scattering detector device.

Abstract: Apparatus for detecting radiation, including a detector which is configured to generate electrical charges responsive to incidence of a photon on the detector. The apparatus includes a plurality of detector circuits coupled to the detector at different respective locations. Each detector circuit consists of an amplifier which is configured to generate a pulse in response to the charges, and a first pulse shaper, having a first time constant, which is configured to produce a metric representative of an energy of the pulse. Each detector circuit also has a second pulse shaper, having a second time constant greater than the first time constant, which is configured to produce an indication that the metric is representative of an energy of the photon. The apparatus also includes a summing device which is coupled to sum the metric of each of the detector circuits in response to the respective indication.

Abstract: Apparatus for detecting radiation, including a semiconductor which is arranged to interact with photons of the radiation, and a plurality of electrodes which are configured to sense respective charge distributions in response to interactions of the photons with a region of the semiconductor. The apparatus includes circuitry having respective detector circuits coupled to the electrodes to detect the interactions. The circuitry is configured to receive the respective charge distributions from two or more of the electrodes so as to generate respective energy distributions of the photons for each of the two or more electrodes, to compensate for variations in detection characteristics of the respective detector circuits so as to align the respective energy distributions with each other to form aligned distributions, to sum the aligned distributions to generate an overall energy distribution of the photons, and to output a signal indicative of the overall energy distribution.

Abstract: A semiconductor wafer is radiated with an electron beam so that the inelastic scattering takes place in the narrow region, and current flows out from the narrow region; the amount of current is dependent on the substance or substances in the narrow region so that the analyst evaluates the degree of contamination on the basis of the substance or substances specified in the narrow region.

Abstract: A photon-counting detector includes a direct conversion material constructed to directly convert an energy of at least one incident photon to an electrical signal indicative of the energy level of the at least one individual photon and a data acquisition system (DAS). The DAS includes a first comparator having a first signal level threshold that is less than an electrical signal level that is indicative of a maximum energy of a spectrum of photons, the first comparator configured to output a count when the electrical signal level exceeds the first signal level threshold, and a second comparator having a second signal level threshold that is greater than or equal to the electrical signal level indicative of the maximum energy of the spectrum of photons, the second comparator configured to output a count when the electrical signal exceeds the second signal level threshold.

Abstract: System and method for determining an energy window in a medical imaging system. The imaging system, designed to operate in a single photon counting mode, includes a pixilated radiation detector having an array of detector elements coupled to respective electronic channels. The method includes measuring the electronic signals produced for each detector element and producing two spectra corresponding to two different energy levels of photons, deriving an electrical offset for the signals received from each detector element and producing corrected signals and a corrected spectrum of radiation flux impinging on the detector, calculating a peak channel value measured in units of energy channels, and determining an energy window for each detector element such that the width of the window is equal to a desired fraction of the peak channel value.

Abstract: A combined format gamma-ray detector (D) for measuring impinging gamma-rays (10) includes an active upper level coded aperture detector plane member (12) that is suitable for detecting an impinging gamma-ray (10). An active lower level gamma ray detector plane member (14) that is spaced apart from the upper level coded aperture (12) detects an impinging gamma-ray (10). At low gamma-ray energies, the combined format gamma-ray detector device (D) operates as a conventional coded aperture system and at higher gamma-ray energies, the combined format gamma-ray detector device operates as a Compton scattering detector device.

Abstract: A digital radiographic unit is disclosed which includes a counting flat image detector for taking radiographs from an x-radiation with the aid of pixel readout units, adjacent in a matrix, for measuring and counting charge pulses generated by x-ray quanta of the x-radiation. A coincidence, occurring within a specific time interval, of charge pulses of a pixel readout unit and of charge pulses of at least one bordering pixel readout unit, is detected and the corresponding charge pulses are summed to form a total charge pulse as basic variables for a further evaluation.

Abstract: A camera sub-module is provided for providing tomographic imaging of radiation emissions generated internally by a body. The camera sub-module includes a radiation-emitting layer having a radioactive source for emitting transmission emissions, and at least one radiation-detection layer for contemporaneously detecting and permitting differentiation between the transmission emissions and emissions generated internal to an imaged body administered with a positron-emitting radiotracer. Also provided herein are imaging systems, scanners, and other apparatus and methods.

Abstract: An IR imaging system includes a lens module and an imaging module coupled to the lens module. The lens module includes a barrel defining a through hole, at least one lens received in the through hole and an IR bandpass filter received in the barrel and configured for filtering out visible light. The imaging module includes a housing and an IR image sensor received in the housing. The IR imaging system can prevent IR image sensors being affected by visible light.

Abstract: Method and apparatus for sensing and acquiring radiation data comprises sensing radiation events with a multi-modality detector. The detector comprises solid state crystals forming a matrix of pixels which may be arranged in rows and columns, and has a radiation detection field for sensing radiation events. The radiation events for each pixel are counted by an electronic module attached to each pixel. The electronic module comprises a threshold analyzer for analyzing the radiation events. The threshold analyzer identifies valid events by comparing an energy level associated with the radiation event to a predetermined threshold. The electronic module further comprises at least a first counter for counting the valid events.

Abstract: A spectrometer having improved energy resolution by correcting for error introduced by charge carrier trapping. By monitoring the shape of the pulses produced by the detector, a digital filter is adjusted to improve the energy resolution. The adjustment is performed manually by an operator or automatically by an automatic optimizer circuit that modifies the digital filter until the spectral peaks have a width and shape matching the desired characteristics, which are a minimum width and a substantially symmetrical shape. By correcting for the energy loss associated with long rise time events, the charge-trapping correcting spectrometer produces spectral peaks with improved energy resolution.

Abstract: Rays incident upon a plurality of detection plates arranged along a normal direction are detected. A distance between the ray and the ray source is estimated based on the number of counted rays detected by each detection plate, and each interval distance of the detection plates. Moreover, the direction of the source of the ray is estimated based on each image obtained from each detection plate.

Abstract: A device and method for measuring a depth of interaction of an ionizing event and improving resolution of a co-planar grid sensor (CPG) are provided. A time-of-occurrence is measured using a comparator to time the leading edge of the event pulse from the non-collecting or collecting grid. A difference signal between the grid signals obtained with a differential amplifier includes a pulse with a leading edge occurring at the time-of-detection, measured with another comparator. A timing difference between comparator outputs corresponds to the depth of interaction, calculated using a processor, which in turn weights the difference grid signal to improve spectral resolution of a CPG sensor. The device, which includes channels for grid inputs, may be integrated into an Application Specific Integrated Circuit. The combination of the device and sensor is included. An improved high-resolution CPG is provided, e.g., a gamma-ray Cadmium Zinc Telluride CPG sensor operating at room temperature.

Abstract: The invention concerns a radiation detection device comprising a plurality of detector elements (DET1, DET2), each detector element (DET1) being associated with a circuit (AMP1-CMP1) for acquiring pulse signals (H1) and for counting (CNT1) detection events. The invention provides for means (COR) of correlating detection events corresponding to at least two detector elements (DET1/DET2).

Abstract: The invention relates to an instrument which uses an individual semi-conductive detector with special coverings as an essential sensor, and a method whereby the amplitude information of the signals from said semi-conductive detector are used to determine a person's dose in mixed neutron/photon-fields. Said instrument is highly sensitive and has a low energy dependency. It is possible for the dose to be read directly, and to emit a warning if the dose limit is exceeded. The inventive method enables a compact person's dose meter, which is immune to interference, to be produced with low power consumption.

Abstract: A radiation detector has a plurality of semiconductor cells arranged in a matrix. Each of the plurality of semiconductor cells detects radiation separately, and outputs a signal representing the energy of radiation separately. A selection circuit selects, among events wherein radiation is detected, specific events wherein radiation derived from radio-isotope injected to a subject is detected. In the first case wherein either one semiconductor cell outputs a signal, the energy of the signal is compared with a predetermined energy window. In the second case wherein two or more semiconductor cells output two or more signals substantially simultaneously, the total energy of the two or more signals is compared with the predetermined energy window. A position calculation circuit calculates, in the first case the incidence position of the radiation based on the positions of the semiconductor cells that output signals.

Abstract: A detector module is for CT and/or PET and/or SPECT examinations, and includes a number of measuring channels. Each measuring channel includes a direct converter for directly converting incident measuring radiation into analog electric signals, a pulse generator connected to the direct converter, for generating counting pulses as a function of the received electric signals, and a counting device that counts the received counting pulses over a prescribable time period and outputs the result. Arranged between the counting device and the pulse generator is an externally drivable changeover unit that can be used to switch over between the counting device and an event detector that registers and outputs for each received counting pulse the time and the associated measuring channel or an item of location information assigned to this measuring channel. The present detector module is of simple design.

Abstract: A hybrid x-ray detector includes: a first detector that is adapted to receive x-rays, the first detector absorbs a first portion of the x-rays and allows a second portion of the x-rays to pass through the first detector; and a second detector that is adapted to receive the second portion of the x-rays. A radiation imaging system includes: an x-ray source that produces x-rays; and an image detector assembly that is adapted to receive the x-rays, the image detector assembly having a hybrid x-ray detector that includes: a first detector that is adapted to receive the x-rays, the first detector absorbs a first portion of the x-rays and allows a second portion of the x-rays to pass through the first detector; a second detector that is adapted to receive the second portion of the x-rays; and an x-ray source.

Abstract: A novel method of manufactring a microchannel plate (“MCP”) is disclosed. The method comprises the steps of ion implantation of a substrate, the subsequent formation of channels paterned on the surface of the substrate and bonding of the subsequent substrate to a handle wafer. The layers are subsequently cleaved and the steps repeated until a MCP structure is achieved. The resulting MCP structure is cost-effective as compared to conventional manufacturing processes and the resulting MCP structure exhibits a funneling effect. The MCP structure may also be used for optical signal amplification for a biochip array.

Abstract: According to the present invention, provided are an image discrimination apparatus and an image discrimination method for determining whether diaphragmatic radiation has been employed to obtain an autoradiograph of an object using a radiographic device having a diaphragmatic radiation function. According to the image discrimination apparatus and the image discrimination method of the present invention, an autoradiographic signal is entered and a first characteristic value is calculated using an autoradiograph designated by the autoradiographic signal, and then a frequency is calculated for the appearance of a density value for pixels constituting the edge of the autoradiograph that is determined using the first characteristic value and the frequency is employed to determine whether the autoradiograph has been obtained by using diaphragmatic radiation.

Abstract: A radiation detector formed using silicon-on-insulator technology. The radiation detector includes a silicon layer formed on an insulating substrate, wherein the silicon layer includes a PNPN structure, and a gate layer formed over the PNPN structure, wherein the gate layer includes a PN gate. Latch-up occurs in the radiation detector only in response to incident radiation.

Abstract: The invention relates to a radiation detector, an arrangement and a method for an energy-dispersive detection of X-ray photons. X-ray photons are allowed to collide (701) in the radiation detector (201, 601), whereby there are produced (702, 703, 704, 705, 706, 707, 708) observations of the X-ray photons that collided in the detector. According to the invention, there are separately produced observations of X-ray photons (702, 703, 704) that collided in the first detector space (205, 501) of the radiation detector and X-ray photons (705, 706, 707, 708) that collided in the second detector space (206, 502) of the radiation detector. The (712) observations of X-ray photons that collided in the first detector space (205, 501) are ignored, when there is received a simultaneous observation of an X-ray photon that collided in the second detector space.

Abstract: An optical measurement apparatus 10 primarily includes: a photon detection unit 12 for detecting incident photons, a time signal output unit 14 for outputting a time signal, and a storage unit 16 for storing the time signal outputted from the time signal output unit 14 when the photon detection unit 12 detects photons. The photon detection unit 12 includes a HPD 24 having a photocathode 24a and an APD 24b, a TZ amplifier 26, a peak holding circuit 28, and an A/D converter 30. The time signal output unit 14 includes a timer 32 and a counter 34. The storage unit 16 includes a comparator 36 and a memory 38. When photons impinge on the HPD 24, a trigger signal is outputted from the comparator 36, causing the photon-number outputted from the A/D converter 30 and the time data outputted from the counter 34 to be stored in the memory 38.

Abstract: A detector for ionising radiation comprises first (10) and second (12) diamond detector elements which are connected to a common contact (14). The two detector elements are of differing thickness and are optimised for the detection of different types of radiation, so that the detector simultaneously provides two output signals indicative of different kinds of radiation incident on the detector.

Abstract: In case of performing so-called “PET acquisition”, a nuclear medical diagnosis apparatus according to the present invention does not set only gamma rays which imparted predetermined energy values (for example, energy values of and above a Compton edge), as subjects for coincidental counting acquisition (coincidence acquisition), but it discriminates also further gamma rays which caused a photoelectric effect after having undergone Compton scattering once in a radiation detection unit, so as to set them as subjects for the coincidental counting acquisition. Concretely, if the added value of energy values observed in two detection elements is “near 511 keV”, the existence of the further gamma ray is presumed, and the acquisition thereof is possible. Besides, that one of the two detection elements as to which energy near the Compton edge is observed can be specified as the incident position of the gamma ray on the radiation detection unit.

Abstract: Microcalorimeters are arranged in a n×m matrix, and plural element groups are composed of the microcalorimeters. Each element group is composed of n calorimeters arranged in a column. AC biases having different frequencies are applied to their respective element groups. The elements produce output signals in response to given external information. The output signals from corresponding elements belonging to their respective different element groups are superimposed on their respective AC biases and added with signal adders. A multiplex signal of the thus added output signals can be taken out on one signal line and read. Each microcalorimeter is placed in a bridge-type circuit to cancel out the AC bias in the output in the absence of a signal in the microcalorimeter.

Abstract: The invention relates to a spectrometric detection system comprising a block (6) of semi conducting material, a cathode (7) fixed on the first face of the block of semi conducting material, and an anode (8) fixed on a second face of the block of semi conducting material, the first and second faces being opposite to each other.

Abstract: The present invention relates to a process and installation for simultaneously measuring the flux of ionizing radiation, of an energy greater than several kVe and the dose of radiation received by a body exposed to this radiation.

Abstract: In a radiation detector: a CsI:Tl (or CsI:Na) scintillator receives a number X of radiation quantums for each pixel, and emits a number L of photons constituting fluorescent light in response to each radiation quantum; photoelectric converters containing Si (or Se) as a main component are arranged corresponding to respective pixels to receive the fluorescent light with an entrance efficiency T, and generate charges when the fluorescent light is detected; and a capacitor is connected to each photoelectric converter, and stores the charges generated by the photoelectric converter. When the radiation detector receives a 10 to 300 mR dose of the radiation, the numbers X and L, the entrance efficiency T, the fill factor F and the photoelectric conversion efficiency &eegr; of each photoelectric converter, and the maximum storable charge amount Q of the capacitor satisfy a relationship X·L·T·F·&eegr;≦Q.

Abstract: A device for locating radiopharmaceutical labeled diseased or malfunctioning candidate cells within a human body and a method for using the device. The method includes the labeling of target cells in a body with a radionuclide and the identification in situ of the candidate cells using a body insertable nuclear probe sensitive to the presence of the radionuclide label. More particularly, the invention relates to using a beta or gamma probe to locate labeled cells, also referred to as candidate cells while simultaneously generating an MRI image and/or a visual image. The device may also include attachments to the distal tip if the probe which allows the position of the tip within the body to be tracked and recorded or the aperture to be varied in size.

Abstract: The present invention relates a method of enhancing contrast information from an x-ray detecting arrangement, when detecting a number of photons in said arrangement comprising at least two adjacently arranged sensors provided on one substrate, each sensor having a corresponding output signal, each of which can be influenced due to shared charge from a photon detected in one of said adjacent sensors, which detected photon indirectly creates an amount of free charges proportional to the photon energy, wherein said influence on said signal is considered by weighting said photon with respect to possible said photon charge-share between said at least two adjacent sensors.

Abstract: An intraoperative probe system for preferentially detecting beta radiation over gamma radiation emitted from a radiopharmaceutical is described. In one embodiment, the probe system of the present invention is a probe having an ion-implanted silicon charged-particle detector for generating an electrical signal in response to received beta particles. In such an embodiment, a preamplifier may be located in close proximity to the detector filters and amplifies the electrical signal. Furthermore, a wire may be used to couple the probe to a processing unit for amplifying and filtering the electrical signal, and a counter may be utilized to analyze the resulting electrical signal to determine the number of beta particles being received by the detector. Alternatively, the wire can be replaced with an infrared or radio transmitter and receiver for wireless operation of the probe.

Abstract: A heterostructure or multilayer semiconductor structure having lattice matched layers with different bandgaps is grown by MOCVD. More specifically, a wide bandgap material such as AlInSb or GaInSb is grown on a substrate to form a lower-contact layer. An n-type active layer is lattice matched to the lower contact layer. The active layer should be of a narrow bandgap material, such as InAsSb, InTlSb, InBiSb, or InBiAsSb. A p-type upper contact layer is then grown on the active layer and a multi-color infrared photodetector has been fabricated.

Abstract: A semiconductor base device for the detection of gamma radiation. The semiconductor base device includes a semiconductor base detector with a resistivity exceeding 109 &OHgr;·cm. An operational amplifier is located directly at the detector output, without a decoupling capacitor between the detector and the preamplifier. A data processing device makes use of the rise time of the electronic component of a signal output by the detector.