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A new method for position-sensitive measurement of beta surface contamination

Nuclear Science and Techniques 2017年第2期28卷 49-56页

作者： Yan-Tao Qu Hui Wang Yang Liu Ling Chen Jie Hou Zhe Liu Ji-Zeng Ma Department of Radiation Protection China Institute of Atomic Energy Beijing 102413 China Nuclear and Radiation Safety Center Ministry of Environment Protection Beijing 100082 China Occupational Radiation Protection Unit Radiation Safety and Monitoring Section NSRW IAEA PO Box 1001400 Vienna Austria

In this paper, we propose a new method for position-sensitive measurement of beta surface contamination. With a position-sensitive detector of enlarged sensitive detection area, accurate information of the contamination distribution can be obtained. The positionsensitive detection is based on a large-area plastic scintillator and the wavelength shifting(WLS) fibers and adopts the ‘‘light center of gravity'' method. Optical transmission of the detector is simulated with a preliminary detector model, and feasibility of the detector design and measurement method is evaluated using an experiment *** simulation and experiment results at different beta-ray incident points on the scintillator surface show that there is a polynomial relationship between the average amplitude ratio of the output pulses from the two parallel WLS fibers in the same fiber layer and the relative distance from the incident point to the WLS fiber.

关键词： Beta surface contamination position-sensitive measurement Wavelength shifting fibers Plastic scintillator

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Preliminary results of a Compton camera based on a single 3D position-sensitive CZT detector

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Nuclear Science and Techniques 2018年第10期29卷 210-220页

作者： Yi-Lin Liu Jian-Qiang Fu Yu-Lan Li Yuan-Jing Li Xu-Ming Ma Lan Zhang Department of Engineering Physics Tsinghua UniversityBeijing 100084China Nuctech Co Ltd Haidian DistrictBeijing 10084China

A Compton camera prototype has been developed using a pixelated CZT detector with 4-by-4 *** of the detector are read out by a VASTAT ASIC that is controlled by a self-developed DAQ board. The DAQ software is developed using LabVIEW, and the offline Compton imaging codes are written in C++. The prototype has been successfully calibrated, and its capabilities for source detection, spectroscopy, and Compton imaging have been demonstrated using a Cs-137 *** angular resolution of the 662 keV line is 36° FWHM for the simple back-projection method and 9.6° FWHM for the MLEM reconstruction method. The system is ready to be extended to 11-by-11 pixels in the future, and a better imaging quality can be expected due to the better relative position resolution.

关键词： Compton imaging 3D position-sensitive technique CZT detector

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Electrostatic-lenses position-sensitive TOF MCP detector for beam diagnostics and new scheme for mass measurements at HIAF

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Nuclear Science and Techniques 2019年第10期30卷 63-73页

作者： Jun-Hao Liu Zhuang Ge Qian Wang Geng Wang Li-Na Sheng Wen-Wen Ge Xing Xu Peng Shuai Qi Zeng Bo Wu University of Chinese Academy of Sciences Beijing 100049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

A foil–microchannel plate(MCP)detector,which uses electrostatic lenses and possesses both good position and timing resolutions,has been designed and simulated for beam diagnostics and mass measurements at the next-generation heavy-ion-beam facility HIAF in *** by low energy loss and good performances of timing and position measurements,it would be located at focal planes in fragment separator HFRS for position monitoring,beam turning,Bq measurement,and trajectory ***,it will benefit the building-up of a magnetic-rigidity–energy-loss–time-offlight(BqDETOF)method at HFRS for high-precision in-flight particle identification of radioactive isotope beams on an event-by-event *** importantly,the detector can be utilized for in-ring TOF and position measurements,beam-line TOF measurements at two achromatic foci,and position measurements at a dispersive focus of HFRS,thus making it possible to use two complementary mass measurement methods[isochronous mass spectrometry at the storage ring SRing and magnetic-rigidity–time-of-flight(BqTOF)at the beam-line HFRS]in one single experimental run.

关键词： Microchannel plate Electrostatic lenses Detector position-sensitive Time-of-flight Mass measurements HIAF

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