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公开(公告)号：US11194061B2
公开(公告)日：2021-12-07
申请号：US16623032
申请日：2018-06-19
发明人： Ryosuke Ota
IPC分类号： G01T1/20 , A61B6/03 , G01T1/208 , H01L27/146
摘要： A photodetector includes N photodetection pixels arranged one-dimensionally or two-dimensionally and each for generating a detection signal in response to incidence of light, and a single output terminal for outputting the detection signal generated in each of the N photodetection pixels. Each of the N photodetection pixels includes an avalanche photodiode operating in Geiger mode, and a quenching resistor connected in series to the avalanche photodiode, and the N photodetection pixels are configured to output detection signals having time waveforms different from each other.
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公开(公告)号：US10996348B2
公开(公告)日：2021-05-04
申请号：US16394032
申请日：2019-04-25
发明人： Ryosuke Ota , Motohiro Suyama , Hideki Shimoi
IPC分类号： G01T1/22 , G01T1/24 , G01T1/20 , G01T1/202 , G01N23/095
摘要： A gamma ray detector is a detector detecting gamma rays and includes a photomultiplier tube having an entrance window and a photoelectric surface. The entrance window is a Cherenkov radiator. The photoelectric surface is formed on a vacuum side of the entrance window via an intermediate layer. The thickness of the intermediate layer is equal to or less than the wavelength of Cherenkov light emitted by an interaction of the gamma rays with the entrance window.
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公开(公告)号：US11041965B2
公开(公告)日：2021-06-22
申请号：US16623037
申请日：2018-06-19
发明人： Ryosuke Ota
摘要： A radiation detection device includes a scintillator, a photodetector for detecting scintillation light from the scintillator and outputting a detection signal, a first comparator for comparing the detection signal with a first threshold voltage V1 and outputting a signal having a first time width T1, a first time width measurement device for measuring the first time width T1, a second comparator for comparing the detection signal with a second threshold voltage V2 and outputting a signal having a second time width T2, a second time width measurement device for measuring the second time width T2, and an analysis unit for obtaining a time constant τ indicating a time waveform of the detection signal based on the first and second time widths T1 and T2.
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公开(公告)号：US10816682B2
公开(公告)日：2020-10-27
申请号：US16344458
申请日：2017-10-27
发明人： Ryosuke Ota
摘要： A radiation position detector includes a radiator including a medium that generates light in a first wavelength region and light in a second wavelength region by interacting with incident radiation, a first photodetector that includes a plurality of first two-dimensionally arranged pixels and detects the light in the first wavelength region, and a second photodetector that includes a plurality of second two-dimensionally arranged pixels and detects the light in the second wavelength region.
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公开(公告)号：US10925557B2
公开(公告)日：2021-02-23
申请号：US16543728
申请日：2019-08-19
发明人： Motohiro Suyama , Hideki Shimoi , Ryosuke Ota , Ryoko Yamada
摘要： A high-energy ray detector includes a detection unit in a vacuum container. The detection unit includes a first electron multiplier, a second electron multiplier, and an electron collector. Each of the first electron multiplier and the second electron multiplier has one or more MCPs each configured to emit electrons by interaction with an incident high-energy ray (γ-ray, X-ray (in particular hard X-ray), or neutron ray), and multiply and output the electrons. The electron collector is transmissive for the high-energy ray. The electron collector is configured to collect the electrons multiplied and output from each of the first electron multiplier and the second electron multiplier, and output an electric pulse signal.
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公开(公告)号：US10795035B2
公开(公告)日：2020-10-06
申请号：US16344502
申请日：2017-10-27
发明人： Ryosuke Ota
摘要： A charged particle track detector includes a radiator including a medium that generates Cherenkov light by interacting with incident charged particles, a light detection unit in which a plurality of two-dimensionally arrayed pixels are disposed to correspond to a predetermined surface of the radiator, and a control unit configured to acquire position information and time information of the plurality of pixels that have detected the Cherenkov light based on a signal output from the light detection unit, and configured to obtain a track of the charged particles based on the acquired position information and the acquired time information, and a propagation locus of the Cherenkov light in the radiator.
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公开(公告)号：US09759820B2
公开(公告)日：2017-09-12
申请号：US15333350
申请日：2016-10-25
发明人： Ryosuke Ota , Ryoko Yamada , Tomohide Omura , Mitsuo Watanabe
CPC分类号： G01T1/2006 , G01T1/2985
摘要： A scintillator array including a plurality of scintillators, an optical detector array corresponding to the scintillators, an AD conversion unit configured to convert an analog signal output from each optical detector into digital data, and a position detection processing unit configured to specify a position of the scintillator on which the radiation is incident are provided. If there are two different pieces of digital data at the same time, the position detection processing unit determines that radiation is incident on two scintillators when energy value data of the two pieces of digital data is greater than an energy value of a Compton edge and specifies the address of the scintillator on which the radiation is incident by comparing the energy values of the two pieces of digital data when at least one of the two energy values is less than the energy value of the Compton edge.
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