首页|面向PGNAA技术的碘化钠探测器MCNP模拟计算

面向PGNAA技术的碘化钠探测器MCNP模拟计算

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碘化钠(NaI)探测器因其优秀的探测效率和相对较低的成本在瞬发γ射线中子活化分析技术(prompt gamma-ray neutron activation analysis，PGNAA)中具有广泛应用。为了获取PGNAA测量过程中探测器对γ射线的响应，针对NaI探测器建立了蒙特卡罗模型，基于该模型对中子以及γ射线输运过程进行模拟计算。对60Co、137Cs、152Eu、133Ba和241Am标准点源以及137Cs水体源进行了测量分析，并与MCNP模拟计算进行对比，结果显示两者吻合。之后结合D-D中子发生器对水溶液进行测量，并分析H元素辐射俘获反应产生的 2。223 MeV特征γ射线。研究结果表明，MCNP模拟计算的H元素特征峰计数与测量的结果偏差为 13%，证明了MCNP建立的NaI测量系统模型能够实现对γ和中子混合输运过程的模拟仿真，可为后续系统优化工作的开展奠定基础。
MCNP Simulation of NaI Detector for PGNAA Technology
Sodium iodide(NaI)detector has wide applications in Prompt Gamma-ray Neutron Activation Analysis(PGNAA)due to its excellent detection efficiency and relatively low cost.In order to obtain the response of the detector to gamma-rays during PGNAA measurement process,a Monte Carlo model was established for the NaI detector to simulate the transport processes of neutrons and gamma-rays.Measurements and analyses were conducted on standard point sources of 60Co,137Cs,152Eu,133Ba,and 241Am,as well as a waterborne source of 137Cs.These measurements were compared with MCNP simulation calculations,and the results demonstrated agreement between the two methodologies.Then,measurements were conducted on aqueous solutions using a D-D neutron generator,and the 2.223 MeV characteristic gamma-ray produced by the H element radiative capture reaction was analyzed.The research results show that the deviations between MCNP simulation calculations of characteristic peaks for the H element and experimental measurements were consistently within 13%,demonstrating that the NaI measurement system model established by MCNP can simulate the transport processes of gamma and neutrons,laying a foundation for the subsequent optimization of the system and other related work.

NaI detectorMCNP simulationprompt gamma-ray spectrumneutron transport

王泽亮、贾文宝、杨晓艳、张镇华、张焱、程璨

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南京航空航天大学,南京 211106

内蒙古自治区计量测试研究院,呼和浩特 010030

东华理工大学,南昌 330013

南京工业大学,南京 210023

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NaI探测器 MCNP模拟 瞬发γ射线能谱 中子输运

国家自然科学基金项目国家自然科学基金项目国家重点研发计划江西省自然科学基金项目江西省自然科学基金项目江苏省市场监督管理局科技计划项目江苏省市场监督管理局科技计划项目江苏省市场监督管理局科技计划项目放射医疗协同创新中心项目

12105143423742262023YFF07170032023BAB20104320232BCJ23006KJ2024009KJ2024044KJ2023015YF202301

2024

10.7538/tws.2024.youxian.068

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中国核学会同位素分会

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CSTPCD
影响因子：0.405
ISSN：1000-7512
年,卷(期)：2024.37(5)