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energy calibration of a BC501A liquid scintillator using a γ-γ coincidence technique

Chinese Physics C 2010年第7期34卷 993-997页

作者：言杰刘荣李澄蒋励鹿心鑫朱通华 Department of Modern Physics University of Science and Technology of China Institute of Nuclear Physics and Chemistry Chinese Academy of Engineering Physics

An accurate energy calibration of a BC501A liquid scintillator by means of Compton scattering of γ-rays is *** energy resolution and the position of the Compton edge have been precisely determined using a γ-γ coincidence technique and fitting the coincidence spectrum with a Gaussian function superimposed on a quadratic polynomial for the *** position of the Compton edge relative to the position of the maximum and the half height of the distribution in dependence on the relevant energy resolution is discussed in *** results indicate that the maximum energy of the recoil Compton electron does not occur at the half height distribution but at 0.90±0.05 of the maximum height in the energy range *** energy resolution varies from 15.6% to 8.02% for electrons in the energy region from 0.5 MeV to 3 MeV.

关键词： BCS01A liquid scintillator energy calibration γ-γ coincidence

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Study on gamma response function of EJ301 organic liquid scintillator with GEANT4 and FLUKA

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Chinese Physics C 2013年第12期37卷 65-70页

作者：张苏雅拉吐陈志强韩瑞刘星泉 R.Wada 林炜平靳增雪席印印刘建立石福东 Institute of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Lanzhou University Cyclotron Institute Texas A&M University College Station College of Nuclear Science and Technology Harbin Engineering University

The gamma response function is required for energy calibration of EJ301 （5 cm in diameter and 20 cm in height） organic liquid scintillator detector by means of gamma sources. The GEANT4 and FLUKA Monte Carlo simulation packages were used to simulate the response function of the detector for standard 22Na, 60Co, 137Cs gamma sources. The simulated results showed a good agreement with experimental data by incorporating the energy resolution function to simulation codes. The energy resolution and the position of the maximum Compton electron energy were obtained by comparing measured light output distribution with simulated one. The energy resolution of the detector varied from 21.2% to 12.4% for electrons in the energy region from 0.341 MeV to 1.12 MeV. The accurate position of the maximum Compton electron energy was determined at the position 81% of maximum height of Compton edges distribution. In addition, the relation of the electron energy calibration and the effective neutron detection thresholds were described in detail. The present results indicated that both packages were suited for studying the gamma response function of EJ301 detector.

关键词： gamma response function E J301 organic liquid scintillator energy calibration energy resolutionfunction GEANT4 FLUKA Compton edge

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Digital logarithmic airborne gamma ray spectrometer

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Chinese Physics C 2014年第7期38卷 73-81页

作者：曾国强张庆贤李晨谭承君葛良全谷懿程锋 Chengdu University of Technology

A new digital logarithmic airborne gamma ray spectrometer is designed in this study. The spectrometer adopts a high-speed and high-accuracy logarithmic amplifier （LOGll4） to amplify the pulse signal logarithmically and to improve the utilization of the ADC dynamic range because the low-energy pulse signal has a larger gain than the high-energy pulse signal. After energy calibration, the spectrometer can clearly distinguish photopeaks at 239, 352, 583 and 609 keV in the low-energy spectral sections. The photopeak energy resolution of 137Cs improves to 6.75% from the original 7.8%. Furthermore, the energy resolution of three photopeaks, namely, K, U, and Th, is maintained, and the overall stability of the energy spectrum is increased through potassium peak spectrum stabilization. Thus, it is possible to effectively measure energy from 20 keV to 10 MeV.

关键词： logarithmic amplifier airborne gamma ray spectrometer energy calibration wide-range spectrummeasurement cosmic rays measurement

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calibration of the focal plane detectors for a compact MPR neutron spectrometer with proton beam from HI-13 tandem accelerator

Calibration of the focal plane detectors for a compact MPR n...

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第十三届全国等离子体科学技术会议

作者： Guoguang Zhangab,Xia Lib , Ji Baob , Jianfu Zhanga, Long Houb ,Zuying Zhoub, aNorthwest Institute of Nuclear Technology, Xi’an, Shaanxi, 710024, P.R.C bChina Institute of Atomic energy, Beijing, 102413, P.R.C

A new compact magnetic proton recoil (MPR) type spectrometer has been developed for diagnosing fusion neutrons. The designs of beam optics and focal plane detectors (FPD) of the MPR spectrometer are presented. The calibration experiment of the FPD, which is consisted of silicon micro strips, has been performed on the HI-13 tandem accelerator at China Institute of Atomic energy (CIAE). The uncertainty of the measurement data is discussed.

关键词： focal plane detector energy calibration magnetic proton recoil spectrometer beam optics

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