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Studies of timing properties for a TOF counter at an external target facility

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Chinese Physics C 2009年第9期33卷 781-784页

作者：余玉洪徐华根徐瑚珊詹文龙孙志宇郭忠言胡正国陈俊岭唐述文 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

Timing and amplitude properties of a prototype scintillator TOF counter at an external target facility are studied with a cosmic rays test. The dependence of signal pulse height and time resolution on the coordinate along the scintillator TOF counter is investigated with two different discriminators. A time resolution of 165 ps can be achieved at the center of the counter with a constant fraction discriminator. Time resolution better than 150 ps is obtained at the center with a leading edge discriminator after time wall（ correction is applied for off-line analysis.

关键词： external target facility scintillator discriminator time resolution

Neutron time-of-flight spectroscopy measurement using a waveform digitizer

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Chinese Physics C 2016年第5期40卷 70-74页

作者：刘龙祥王宏伟马余刚曹喜光蔡翔舟陈金根张桂林韩建龙张国强胡继峰王小鹤 Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Key Laboratory of Nuclear Radiation and Nuclear Technology Chinese Academy of ScienceShanghai 201800China

The photoneutron source （PNS, phase 1）, an electron linear accelerator （linac）-based pulsed neutron facility that uses the time-of-flight （TOF） technique, was constructed for the acquisition of nuclear data from the Thorium Molten Salt Reactor （TMSR） at the Shanghai Institute of Applied Physics （SINAP）. The neutron detector signal used for TOF calculation, with information on the pulse arrival time, pulse shape, and pulse height, was recorded by using a waveform digitizer （WFD）. By using the pulse height and pulse-shape discrimination （PSD） analysis to identify neutrons and ＂y-rays, the neutron TOF spectrum was obtained by employing a simple electronic design, and a new WFD-based DAQ system was developed and tested in this commissioning experiment. The DAQ system developed is characterized by a very high efficiency with respect to millisecond neutron TOF spectroscopy.

关键词： neutron spectroscopy scintillator waveform digitizer pulse-shape discrimination (PSD) time-of-flight (TOF)

Recent advances on two-dimensional metal halide perovskite x-ray detectors

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Materials Futures 2023年第1期2卷 71-91页

作者： Mingyue Han Yingrui Xiao Chao Zhou Yuxuan Yang Xiaoxue Wu Qi Hu Xi Jin Wei Zhang Jin-Song Hu Yan Jiang School of Physics and Materials Science Guangzhou UniversityGuangzhouGuangdong 510006People’s Republic of China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Songshan Lake Materials Laboratory DongguanGuangdong 523808People’s Republic of China School of Chemical Engineering and Technology Tianjin University135 Yaguan RoadTianjin 300350People’s Republic of China MOE Key Laboratory of Laser Life Science&Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631People’s Republic of China Beijing National Laboratory for Molecular Sciences(BNLMS) Institute of ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China

In recent years,two-dimensional metal halide perovskites(MHPs)have attracted increased attention for radiation detection and *** detection efficiencies are almost comparable to three-dimensional(3D)***,they demonstrate superior stability to 3D *** pursuit of high-quality,phase-pure and lead-free two-dimensional MHP materials and large-area fabrication capability for x-ray detectors are among the research *** this review,we first give a brief introduction of the crystallographic structure,optoelectronic characteristics and preparation methods of high-quality two-dimensional *** addition,we overview the general working principles of direct and indirect x-ray detection processes and the corresponding performance metrics from the perspective of detection and ***,we provide a comprehensive discussion on the recent advances in 2D perovskite x-ray detectors and imaging ***,we pinpoint several major obstacles of 2D x-ray detectors that should be overcome in the near future.

关键词： two-dimensional metal halide perovskites growth methods scintillator x-ray detector and imaging

Light collection of the POLAR detector

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Science China(Physics,Mechanics & Astronomy) 2010年第S1期53卷 43-46页

作者： DONG YongWei,LI YanGuo,WU BoBing,ZHANG YongJie & ZHANG ShuangNan Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China

POLAR is a compact polarimeter dedicated to measuring the polarization of GRBs between 50-350 *** light collection of 200 mm×6 mm×6 mm plastic bars has been simulated and optimized in order to get uniform response to X-rays at different points along one single *** to the Monte Carlo results,the amplitude uniformity strongly depends on the level of polishing of the scintillator surface and the covering.A uniformity of 89% is achieved with a prototype constructed by a non position-sensitive PMT and an array of 4×4 bars.

关键词： plastic scintillator light collection gamma-ray burst polarimeter

The next generation of crystal detectors

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Radiation Detection Technology and Methods 2018年第1期2卷 7-18页

作者： Ren-Yuan Zhu 256-48 HEPCalifornia Institute of TechnologyPasadenaCA 91125USA

Background In high-energy and nuclear physics experiments,total absorption electromagnetic calorimeters made of inorganic crystals are known for their superb energy resolution and detection efficiency for photon and electron measurements.A crystal calorimeter is thus the choice for those experiments where precision measurements of photons and electrons are crucial for their physics *** is also known that the existing crystal detectors are neither bright nor fast enough nor radiation hard enough to survive severe radiation environment expected in future HEP *** detectors have also been proposed to build a homogeneous hadron calorimeter to achieve unprecedented jet mass resolution by duel readout of both Cherenkov and scintillation light,where the development of cost-effective crystal detectors is a crucial issue because of the 100 cubic meters crystal volume *** To develop novel inorganic crystal scintillatorbased detector concepts for future HEP experiments at the energy and intensity *** Optical and scintillation properties of novel inorganic crystal scintillators,such as excitation,emission and transmittance spectra,light output and decay time,are characterized before and after irradiation by ionization dose and *** performance and radiation hardness are compared to the requirements,and feedback is given to the crystal manufacturers for quality *** As a result of this investigation,several inorganic crystal scintillator-based detector concepts are established for future HEP experiments,such as an LSO/LYSO crystalbased total absorption and/or sampling calorimeter concept,a barium fluoride crystal-based very fast crystal calorimeter concept,and a cost-effective inorganic scintillator-based homogeneous hadron calorimeter *** Bright,fast and radiation hard LYSO/LSO crystals may be used for a total absorption *** LYSO/W Shashlik sampling calorimeter will survive the harsh ra

关键词： Crystal scintillator Calorimeter Radiation damage Fast timing Dual readout

Temperature dependence of the luminescence properties of LaCl3：Ce crystal

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Chinese Physics B 2006年第11期15卷 2756-2760页

作者：裴钰陈晓峰秦来顺姚冬敏任国浩 Shanghai Institute of Ceramics Chinese Academy of Sciences Jiading District Shanghai 201800 China

The optical properties of LaCl3：Ce crystal are reported in this paper. Optical transmission spectrum, photoluminescence and time resolved photoluminescence spectra at different temperatures are investigated. It is found that optical transmittance is as high as 80% between 320 nm and 600 nm, and no obvious absorption band is found in this region. Emission intensity and decay time of photoluminescence are quite stable with the change of the temperature between 80 K and 500 K. No thermal quenching is present up to 500 K, and decay time keeps at 17±2 ns. With the increase of the temperature, the whole emission bands and excitation bands present broadening and overlapping, leading to the strengthening of re-absorption of the Ce^3＋ emission, which makes the emission spectra have a red shift trend.

关键词： LaCl3 scintillator transmittance photoluminescence decay time,temperature dependence

Application of Optical Fiber in Radiation Detection Systems

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Journal of Chemistry and Chemical Engineering 2016年第3期10卷 120-127页

作者： Francisco Antonio Brandao Junior Antonella Lombardi Costa Amo Heeren de Oliveira Departamento de Engenharia Nuclear Universidade Federal de Minas Gerais Av. Ant6nio Carlos 6627 Escola de Engenharia-Campus Pampulha CEP 31270-901 Belo Horizonte Brazil

In the last years, the production of optical fibers cables has made possible the development of a range of spectroscopic probes for in situ analysis performing beyond nondestructive tests, environmental monitoring, security investigation, application in radiotherapy for dose monitoring, verification and validation. In this work, a system using an optical fiber cable to electromagnetic signal transmission from a NaI（TI） radiation detector is presented. The innovative device takes advantage mainly of the optical fibers large passband, small signal attenuation and immunity to electromagnetic interference to application for radiation detection systems. The main aim was to simplify the detection system making it to reach areas where the conventional device cannot access due to its lack of mobility and external dimensions. Some tests with this innovative system are presented and the results stimulate the continuity of the researches.

关键词： NaI(T1) optical fiber radiation detection scintillator

Evaluation of Major Factors Affecting Spatial Resolution of Gamma-Rays Camera

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Journal of Analytical Sciences, Methods and Instrumentation 2013年第4期3卷 227-233页

作者： Hongwei Xie Jianhua Zhang Jinchuan Chen Faqiang Zhang Linbo Li Jianming Qi Yanyun Chu Institute of Nuclear Physics and Chemistry China Academy of Engineering Physic Mianyang China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physic Mianyang China.

The spatial resolution of the gamma-rays camera was measured on a60Co gamma-rays source with edge method. The gamma-rays camera is consisting with rays-fluorescence convertor, optical imaging system, MCP image intensifier, CCD camera, electronic control system and other devices, and is mainly used in the image diagnostics of the intense pulse radiation sources [1]. Due to the relatively big quantum detective efficiency (DQE) and quantum gain of the gamma-rays, etc., the experimental data were processed by averaging multiple images and fitting curves. According to the experimental results, the spatial resolution MTF (modulation transfer function) at the 10% intensity was about 2lp/mm. Meanwhile, because of the relatively big dispersion effects of the fluorescence transmissions in the scintillator and the optical imaging system, the maximal single-noise ratio (SNR) of the camera was found to be about 5:1. In addition, the spatial resolution of the camera was measured with pulse X-rays with 0.3MeV in average energy and exclusion of the effects of secondary electrons from consideration. Accordingly, the spatial resolution MTF at the 10% intensity was about 5lp/mm. This could be an additional evidence to verify the effects of secondary electrons induced by the 1.25MeV gamma-rays in the scintillator upon the spatial resolution. Based on our analysis, the dispersion sizes of the secondary electrons in the scintillator are about 0.4mm-0.6mm. Comparatively, as indicated by the detailed analysis of the spatial resolutions of the MCP image intensifier and CCD devices, both of them have little effect on the spatial resolution of the gamma-rays camera that could be well neglected.

关键词： Gamma-Rays Camera Point Spread Function (PSF) Gamma-Rays Image Detector scintillator MCP Image Intensifier CCD