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The energy response of LaBr_(3)(Ce),LaBr_(3)(Ce,Sr),and NaI(Tl)crystals for GECAM

Nuclear Science and Techniques 2024年第2期35卷 110-122页

作者： Pei-Yi Feng Xi-Lei Sun Zheng-Hua An Yong Deng Cheng-Er Wang Huang Jiang Jun-Jie Li Da-Li Zhang Xin-Qiao Li Shao-Lin Xiong Chao Zheng Ke Gong Sheng Yang Xiao-Jing Liu Min Gao Xiang-Yang Wen Ya-Qing liu Yan-Bing Xu Xiao-Yun Zhao Jia-Cong Liu Fan Zhang Hong Lu Particle and Astrophysics Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Experimental Physics Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology University of South ChinaHengyang 421001China National Engineering Research Center for Rare Earth Grirem Advanced Materials Co.Ltd.and General Research Institute for Nonferrous MetalsBeijing 100088China

The GECAM series of satellites utilizes LaBr_(3)(Ce),LaBr_(3)(Ce,Sr),and NaI(Tl)crystals as sensitive materials for gamma-ray detectors(GRDs).To investigate the nonlinearity in the detection of low-energy gamma rays and address the errors in the calibration of the E-C relationship,comprehensive tests and comparative studies of the three aforementioned crystals were conducted using Compton electrons,radioactive sources,and mono-energetic *** nonlinearity test results of the Compton electrons and X-rays demonstrated substantial differences,with all three crystals presenting a higher nonlinearity for X/-rays than for Compton *** the LaBr_(3)(Ce)and LaBr_(3)(Ce,Sr)crystals having higher absolute light yields,they exhibited a noticeable nonlinear decrease in the light yield,especially at energies below 400 *** NaI(Tl)crystal demonstrated an"excess"light output in the 6-200 keV range,reaching a maximum"excess"of 9.2%at 30 keV in the X-ray testing and up to 15.5%at 14 keV during Compton electron testing,indicating a significant advantage in the detection of low-energy gamma ***,we explored the underlying causes of the observed nonlinearity in these *** study not only elucidates the detector responses of GECAM,but also initiates a comprehensive investigation of the nonlinearity of domestically produced lanthanum bromide and sodium iodide crystals.

关键词： LaBr_(3)(Ce)detector LaBr_(3)(Ce,Sr)detector NaI(Tl)detector GECAM energy response Light yield nonlinearity

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Study on the gamma rays and neutrons energy response optimization of a scintillating fiber detector for EAST with Geant4

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Nuclear Science and Techniques 2023年第9期34卷 40-49页

作者： Wei-Kun Chen Li-Qun Hu Guo-Qiang Zhong Rui-Jie Zhou Bing Hong Qiang Li Li Yang Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Institute of energy Hefei Comprehensive National Science Center(Anhui Energy Laboratory)Hefei 230031China

A new scintillating fiber detector inside magnetic shielding tube was designed and assembled for use in the next round of fusion experiments in the experimental advanced superconducting tokamak to provide D–T neutron yield with time *** this study,Geant4 simulations were used to obtain the pulse height spectra for ideal signals produced when detecting neutrons and gamma rays of multiple *** of the main sources of interference was found to be low-energy neutrons below 10–5 MeV,which can generate numerous secondary particles in the detector components,such as the magnetic shielding tube,leading to high-amplitude output *** address this issue,a compact thermal neutron shield containing a 1-mm Cd layer outside the magnetic shielding tube and a 5-mm inner Pb layer was specifically *** effects on the measurement of fast neutrons and the shielding effect on gamma rays were *** can suppress the height of the signals caused by thermal neutrons to a level below the height corresponding to neutrons above 4 MeV because the yield of the latter is used for detector *** addition,the detector has relatively flat sensitivity curves in the fast neutron region,with the intrinsic detection efficiencies(IDEs)of approximately 40%.For gamma rays with energies that are not too high(response curve cuts off earlier in the low-energy region,which is beneficial for avoiding counting saturation and signal accumulation.

关键词： Sci-Fi detector D–T fusion neutron Thermal neutron shield energy response Geant4

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Study of the energy response of high pressure ionization chamber for high energy gamma-ray

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Chinese Physics C 2008年第5期32卷 370-372页

作者：花正东许浔江王建华刘曙东李建平 Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Institute of High energy Physics Chinese Academy of SciencesBeijing 100049China

The energy response calibration of the commonly used high pressure ionization chamber is very difficult to obtain when the gamma-ray energy is more than 3 MeV. In order to get the calibration of the higher part of the high pressure ionization chamber, we use the Fluka Monte Carlo program to perform the energy response in both the spherical and the cylindrical high pressure ionization chamber which are full of argon gas. The results compared with prior study when the gamma-ray energy is less than 1.25 MeV. Our result of Monte Carlo calculation shows agreement with those obtained by measurement within the uncertainty of the respective methods. The calculation of this study is significant for the high pressure ionization chamber to measure the high energy gamma-ray.

关键词： high pressure ionization chamber Fluka program energy response

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Cost Estimate and Input energy of Floor Systems in Low Seismic Regions

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Computers, Materials & Continua 2022年第5期71卷 2159-2173页

作者： Sayed Mahmoud Alaa Salman Department of Civil and Construction Engineering College of EngineeringImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam 31441Kingdom of Saudi Arabia

Reinforced concrete(RC)as a material is most commonly used for buildings *** floor systems are available following the structural and architectural *** current research study provides cost and input energy comparisons of RC office buildings of different floor *** solid,ribbed,flat plate and flat slab systems are considered in the *** models in three-dimensional using extended threedimensional analysis of building systems(ETABS)and in two-dimensional using slab analysis by the finite element(SAFE)are developed for analysis *** and design using both software packages and manual calculations are employed to obtain the optimum sections and reinforcements to fit cities of low seismic intensities for all the considered building *** ground motion records of low peak ground acceleration(PGA)levels are used to excite the models to measure the input *** cost estimating system is adopted to categorize building components according to 12 ***,Microsoft(MS)Project is utilized to identify the construction cost and duration of each building *** study shows that floor system significantly causes changes in the input energy to *** addition,the slight increase in the PGA increases the amount of input energy particularly flat plate *** cost of the flat plate system that the flat slab system is of higher value as compared to ribbed and conventional slab *** use of drop panels increases this value as ***,the estimated cost of the ribbed slab system exceeds that of conventional system.

关键词： Uniformat system office buildings floor systems energy response cost estimating

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Fusion Neutron Flux Detector for the ITER

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Plasma Science and Technology 2014年第2期16卷 168-171页

作者：袁国梁杨青巍杨进蔚宋先瑛李旭吴华剑王志强 Southwestern Institute of Physics Beijing Nuclear Instruments Factory China Institute of Atomic energy

Two fission chambers with different amounts of fissile material （enriched 90% uranium-235） have been manufactured for neutron flux detection in a thermonuclear fusion device. The characteristics of neutron signal and its discrimination from other signals, and a plateau of high voltage between the anode and cathode have been validated in a thermal neutron source. The energy responses of the two fission chambers at seven energy levels have been calibrated in an accelerator fast neutron source and the results agree well with the simulations.

关键词： fission chamber fusion neutron flux energy response

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Properties study of ZnO:Ga crystal on pulsed radiation detections

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Chinese Physics C 2010年第3期34卷 354-358页

作者：马彦良欧阳晓平张景文张忠兵潘洪波陈亮刘林月 Northwest Institute of Nuclear Technology Xi’an Jiaotong University

In this paper, properties on pulsed radiation detections of ZnO：Ga crystal grew by a magnetron sputtering method were studied. The time response to pulsed laser, pulsed hard X rays and single α particles, the energy response to pulsed hard X ray, the scintillation efficiency to γ rays, the response to pulsed proton, and the relations of the light intensity varied with the proton energy were measured and analyzed in detail. Results show that the ZnO：Ga crystal has potential applications in the regime of pulse radiation detection.

关键词： ZnO:Ga inorganic scintillator radiation detection time response energy response luminescence efficiency

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Simulation of the response functions of an extended range neutron multisphere spectrometer using FLUKA

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Chinese Physics C 2015年第7期39卷 37-41页

作者：王攀峰丁亚东王庆斌马忠剑郭思明李冠稼 Institute of High energy Physics Chinese Academy of Sciences

In this paper, the distribution of radiation field in the CSNS spectrometer hall at Dongguan, China, was simulated by the FLUKA program. The results show that the radiation field of the high energy proton accelerator is dominated by neutron radiation, with a broad range of neutron energies, spanning about eleven orders of *** and calculation of the response functions of four Bonner spheres with a simplified model is done with FLUKA and MCNPX codes respectively, proving the feasibility of the FLUKA program for this application and the correctness of the calculation method. Using the actual model, we simulate and calculate the energy response functions of Bonner sphere detectors with polyethylene layers of different diameters, including detectors with lead layers, using the FLUKA code. Based on the simulation results, we select eleven detectors as the basic structure for an Extended Range Neutron Multisphere Spectrometer（ERNMS）.

关键词： neutron multisphere spectrometer neutron spectrum energy response FLUKA 3He-filled spherical proportional counter

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Experimental study on scintillation efficiency of ZnO:In to proton response

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Chinese Physics C 2011年第11期35卷 1037-1041页

作者：陈亮欧阳晓平张忠兵夏良斌刘金良张显鹏刘林月 Northwest Institute of Nuclear Technology

Film ZnO：In crystal is a good candidate for a scintillation recoil proton neutron detection system and the response of ZnO：In to protons is a crucial point. The energy response of ZnO：In to mono-energetic protons in the range of 10 keV–8 MeV was measured. The experiment was carried out in current mode, and Au foil scattering was employed, where the forward scattering protons were used for exciting the sample, and the backward scattering protons were used for monitoring the beam intensity. According to the result, the yield of light non-linearly depends on proton energy, and drops significantly when proton energy is low. The scintillation efficiency as a function of proton energy was obtained, which is very useful for researching the scintillation recoil proton neutron detection system.

关键词： ZnO:In energy response scintillation efficiency proton neutron detection

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