Abstract: A reactor state monitoring apparatus including: a first gamma ray-dose measurement device that detects and measures an atmospheric radiation dose caused by radioactive substances on a containment vessel side respective to a biological shielding wall surrounding a pressure vessel and outside the pressure vessel; a second gamma ray-dose measurement device that detects and measures a radiation dose on the pressure vessel side respective to the biological shielding wall; a fuel radiation measuring device that detects and measures a radiation dose of fuel in the pressure vessel; and a water amount evaluation device that calculates a difference between radiation doses measured by the fuel radiation measuring device and the first gamma ray-dose measurement device as a corrected fuel radiation dose, and acquires a cooling water level as a water level evaluation value, based on the radiation dose measured by the second gamma ray-dose measurement device and the corrected fuel radiation dose.

Abstract: A radiation detection apparatus includes a selecting unit that allows a light having a light emission wavelength and a polarization direction to pass thorough the selecting unit, an optical system that forms an image of the light, a photon detecting unit that observes the image formed by the optical system, and detects the photon in whole range of the entire image, a counting unit that calculates the number of the alpha rays based on a result of counting the photons derived from the light emission of gas excited by the alpha rays, whereby it is possible to sufficiently eliminate background light (noise light) even if background light is strong, and therefore observe weak light emission.

Abstract: An embodiment of a radiation detector has: a light collecting member; a photo detector that can receive light collected by the light collecting member and count number of photons; a wavelength selector that can selectively transmit light based on the light emission of gas caused by alpha rays by selectively transmitting light of a wavelength in a specific range; a shielding device that is can switch between an opened state in which it transmits light and a closed state in which it shields light; and a counting unit that calculates an alpha dose based on a difference calculated by subtracting number of noise photons detected in the photo detector within a predetermined time period when the shielding device is in the closed state from the number of photons received by the photo detector within the predetermined time period when the shielding device is opened state.

Abstract: In order to reduce the variation of transmitting and receiving sensitivity among a plurality of CMUT cells, an ultrasound diagnostic device comprises: a plurality of CMUT cells each having a vibrating membrane that vibrates when ultrasound is transmitted to or received from a subject; an upper electrode and a lower electrode disposed facing each other on mutually opposite sides of each of the CMUT cells to apply a bias voltage to each of the CMUT cells by a bias power supply; and transmitting and receiving correction units for each correcting the voltage supplied from the bias power supply by using a function using at least one parameter of the thickness and resonance frequency of the vibrating membrane of each of the CMUT cells.

Abstract: An embodiment of a radiation detector has: a light collecting member; a photo detector that can receive light collected by the light collecting member and count number of photons; a wavelength selector that can selectively transmit light based on the light emission of gas caused by alpha rays by selectively transmitting light of a wavelength in a specific range; a shielding device that is can switch between an opened state in which it transmits light and a closed state in which it shields light; and a counting unit that calculates an alpha dose based on a difference calculated by subtracting number of noise photons detected in the photo detector within a predetermined time period when the shielding device is in the closed state from the number of photons received by the photo detector within the predetermined time period when the shielding device is opened state.

Abstract: A radiation detection apparatus includes a selecting unit that allows a light having a light emission wavelength and a polarization direction to pass thorough the selecting unit, an optical system that forms an image of the light, a photon detecting unit that observes the image formed by the optical system, and detects the photon in whole range of the image, a counting unit that calculates the number of the alpha ray based on a result of counting the photon derived from the light emission of gas excited by the alpha ray, and is possible to sufficiently eliminate background light (noise light) even if background light is strong, and therefore observe weak light emission.

Abstract: A reactor state monitoring apparatus including: a first gamma ray-dose measurement device that detects and measures an atmospheric radiation dose caused by radioactive substances on a containment vessel side respective to a biological shielding wall surrounding a pressure vessel and outside the pressure vessel; a second gamma ray-dose measurement device that detects and measures a radiation dose on the pressure vessel side respective to the biological shielding wall; a fuel radiation measuring device that detects and measures a radiation dose of fuel in the pressure vessel; and a water amount evaluation device that calculates a difference between radiation doses measured by the fuel radiation measuring device and the first gamma ray-dose measurement device as a corrected fuel radiation dose, and acquires a cooling water level as a water level evaluation value, based on the radiation dose measured by the second gamma ray-dose measurement device and the corrected fuel radiation dose.

Abstract: In order to reduce the variation of transmitting and receiving sensitivity among a plurality of CMUT cells, an ultrasound diagnostic device comprises: a plurality of CMUT cells each having a vibrating membrane that vibrates when ultrasound is transmitted to or received from a subject; an upper electrode and a lower electrode disposed facing each other on mutually opposite sides of each of the CMUT cells to apply a bias voltage to each of the CMUT cells by a bias power supply; and transmitting and receiving correction units for each correcting the voltage supplied from the bias power supply by using a function using at least one parameter of the thickness and resonance frequency of the vibrating membrane of each of the CMUT cells.

Abstract: A nuclear reactor vibration surveillance system has a first ultrasonic transducer for transmission, an ultrasonic transmitter, a second ultrasonic transducer for reception, an ultrasonic receiver, a signal processor, and a display unit. The first ultrasonic transducer for transmission is arranged on the outer surface of a reactor pressure vessel and is configured to convert a transmission signal into an ultrasonic pulse signal and allow the ultrasonic pulse to be transmitted to a reactor internal component. The second ultrasonic transducer for reception is arranged on the outer surface of the reactor pressure vessel and is configured to receive a reflected ultrasonic pulse reflected by the reactor internal component and convert the received reflected ultrasonic pulse into a reception signal.

Abstract: An ultrasonic probe is disclosed which includes a cMUT chip having a plurality of vibration elements whose electromechanical coupling coefficient or sensitivity is changed according to a bias voltage and transmitting and receiving ultrasonic waves, an acoustic lens arranged above the cMUT chip, and a backing layer arranged below the cMUT chip. An electric leakage preventing unit is provided at the ultrasonic wave transmission/reception surface side of the acoustic lens or between the acoustic lens and the cMUT chip. The electric leakage preventing unit can be, for example, an insulating layer such as a ground layer. Such a structure makes it is possible to provide an ultrasonic probe capable of preventing electric leakage from the ultrasonic probe to an object to be examined so as to improve the electric safety and an ultrasonic diagnostic apparatus using the probe.

Abstract: An ultrasonic probe (2) comprises a cMUT chip (20), which has a plurality of vibration elements whose electromechanical coupling coefficient or the sensitivity changes depending on a bias voltage, and transmits/receives an ultrasonic wave; an acoustic lens (26) provided on the ultrasonic wave radiation side of the cMUT chip (20); a backing layer (22) provided on the back side of the cMUT chip (20) for absorbing propagation of the ultrasonic wave; an electric wiring portion (flexible substrate (72)), which is provided from the peripheral portion of the cMUT chip (20) to the side face of the backing layer (22) and has a signal pattern connected with the electrode of the cMUT chip (20) arranged thereon; and a housing (ultrasonic probe cover (25)) for containing the cMUT chip (20), the acoustic lens (26), the backing layer (22) and the electric wiring portion (flexible substrate (72)).

Abstract: A survey meter for measuring a radioactive contamination caused in an inner surface of a pipe includes a radiation detecting section and a signal processing section. The radiation detecting section includes a rod-shaped light guide unit, a reflecting portion connected to one end surface of the light guide unit, a photoelectric transfer unit, for outputting an electronic signal, connected to another one end surface of the light guide unit, and a scintillator unit provided to a circumference of the light guide unit.

Abstract: There is provided an ultrasound probe including a capacitive transducer for reducing multiple reflections while maintaining a pulse characteristic with which a high-quality image can be obtained, and is also provided an ultrasound imaging apparatus using the ultrasound probe. The ultrasound probe including the capacitive transducer is configured so as to satisfy the condition 6.5/fc<?d, where ? [dB/mm/MHz] denotes the absorption coefficient of an acoustic lens, d [mm] denotes the maximum thickness of the acoustic lens, and fc [MHz] denotes the center frequency of the capacitive transducer, and satisfy the condition L<1/((3?fc)2×C), where L [H] denotes an inductance value per channel of the capacitive transducer, C [pF] denotes a capacitance per channel of the capacitive transducer, and fc [MHz] denotes the center frequency of the capacitive transducer.

Abstract: A survey meter for measuring a radioactive contamination caused in an inner surface of a pipe includes a radiation detecting section and a signal processing section. The radiation detecting section includes a rod-shaped light guide unit, a reflecting portion connected to one end surface of the light guide unit, a photoelectric transfer unit, for outputting an electronic signal, connected to another one end surface of the light guide unit, and a scintillator unit provided to a circumference of the light guide unit.

Abstract: A safety protection instrumentation system for a nuclear reactor is constructed by using digital logic. The digital logic includes functional units in which output logic patterns corresponding to all input logic patterns are verified in advance and a functional module formed by combining the functional units.

Abstract: To miniaturize a probe, increase the channel number, and improve the flexibility of a flexible section, an ultrasound probe includes a transducer unit having a plurality of channels arranged for transmitting and receiving an ultrasound wave, and flexible circuit board is connected to the respective channels of the transducer unit in which a signal line for supplying a transmission signal and extracting a reception signal to/from transducer unit is provided. The flexible circuit board forms at least two channel blocks which are formed by dividing the plurality of channels and are spirally wound individually.

Abstract: An ultrasonic probe (2) comprises a cMUT chip (20), which has a plurality of vibration elements whose electromechanical coupling coefficient or the sensitivity changes depending on a bias voltage, and transmits/receives an ultrasonic wave; an acoustic lens (26) provided on the ultrasonic wave radiation side of the cMUT chip (20); a backing layer (22) provided on the back side of the cMUT chip (20) for absorbing propagation of the ultrasonic wave; an electric wiring portion (flexible substrate (72)), which is provided from the peripheral portion of the cMUT chip (20) to the side face of the backing layer (22) and has a signal pattern connected with the electrode of the cMUT chip (20) arranged thereon; and a housing (ultrasonic probe cover (25)) for containing the cMUT chip (20), the acoustic lens (26), the backing layer (22) and the electric wiring portion (flexible substrate (72)).

Abstract: A reflector system of a fast reactor according to the present invention comprises a reflector having a neutron reflecting portion reflecting a neutron radiated from a reactor core, and a cavity portion provided above the neutron reflecting portion and having a lower neutron reflecting capacity than a coolant, and a reflector drive apparatus coupled to the reflector and moving the reflector in a vertical direction. The reflector drive apparatus has a driving portion which is coupled to the reflector via a drive shaft, and drives the reflector up and down, and a load sensing portion which is provided between the driving portion and the drive shaft, and senses a load of the reflector. A detecting portion receiving a load signal from the load sensing portion so as to detect a breakage of the cavity portion of the reflector is connected to the load sensing portion.

Abstract: An array of a plurality of ultrasonic transducers having a piezoelectric layer 2 and a couple of electrodes 7-1 and 7-2 sandwiching the piezoelectric layer therebetween is provided. The piezoelectric layer 2 has a first piezoelectric layer 2-1 provided on the ultrasonic-wave emission side, a second piezoelectric layer 2-2 provided on the other side of the first piezoelectric layer 2-1, and a common electrode 8 provided therebetween. Each of the ultrasonic transducers has a low-frequency response distribution that is uniform in the minor-axis direction perpendicular to a direction in which the ultrasonic transducers are arranged and a high high-frequency response distribution at a center part in the minor-axis direction. The characteristics of the minor-axis-direction frequency and sound pressure of the first piezoelectric layer are complemented by those of the second piezoelectric layer, whereby a uniform frequency characteristic for a minor-axis-direction low frequency is obtained.

Abstract: An apparatus for verifying a custom IC including a test pattern generating unit for generating a test pattern for verifying a function of the custom IC. The test pattern is output to a master IC and a test IC. The apparatus further includes a comparing unit connected to receive operation signals output from the master IC and the test IC for comparing the operation signals to see if the operation signals are agreed with each other and for generating a comparison signal based on a comparison result, a judging unit connected to receive the comparison signal for judging if there is any abnormality in the test IC and for outputting a judged signal based on a judged result, and a computer connected to receive the judged signal for displaying the judged result of the test IC.