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基于蒙特卡罗方法的α放射源能谱测量模拟
引用本文:许阳阳, 庹先国, 石睿, 等. 基于蒙特卡罗方法的α放射源能谱测量模拟[J]. 强激光与粒子束, 2017, 29: 044001. doi: 10.11884/HPLPB201729.160481
作者姓名:许阳阳  庹先国  石睿  郑洪龙  刘宇琦
作者单位:1.西南科技大学 核废物与环境安全国防重点学科实验室, 四川 绵阳 621 01 0;;;2.四川理工学院 化学与环境工程学院, 四川 自贡 643000;;;3.成都理工大学 地质灾害防治与地质环境保护国家重点实验室, 成都 61 0059
摘    要:运用蒙特卡罗方法建立PIPS-谱仪的腔室模型,模拟谱仪对面源(238Pu)的能谱测量,通过改变放射源与探头之间的距离,模拟不同条件下粒子的射线能谱,同时,对不同探源距条件对射线能谱的影响进行分析;另一方面,使用谱仪在不同探源距的情况下进行能谱实验测量,获得不同条件下射线能谱;最后,将模拟与实验的结果进行对比,分析实验测量结果与模拟结果的相对误差,并对模拟过程及模型参数进行校正,对校正后的模型进行实验验证,使其能够应用到其他放射源的能谱测量中,并且使其可用于单能粒子的能谱研究,研究结果也可为能谱测量技术提供依据,为能谱解谱技术提供数据支持。

关 键 词:PIPS-α谱仪   蒙特卡罗   高斯展宽   探测效率   相关系数
收稿时间:2016-09-29
修稿时间:2016-12-14

Alpha radioactive source spectrum measurement simulationbased on Monte Carlo method
Xu Yangyang, Tuo Xianguo, Shi Rui, et al. Alpha radioactive source spectrum measurement simulationbased on Monte Carlo method[J]. High Power Laser and Particle Beams, 2017, 29: 044001. doi: 10.11884/HPLPB201729.160481
Authors:Xu Yangyang  Tuo Xianguo  Shi Rui  Zheng Honglong  Liu Yuqi
Affiliation:1. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory,Southwest University of Science and Technology,Mianyang 621010,China;;;2. College of Chemistry and Environment Engineering,Sichuan University of Science and Engineering,Zigong 643000,China;;;3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China
Abstract:In the disposal of nuclear waste, regulation and classification of transuranium elements, alpha radioactivity monitoring work in special places such as nuclear arsenal, we usually use the alpha energy spectrum measuring technique. Alpha energy spectrum measurement is one of the key measurements of nuclear radiation, which occupies an important position in the field of nuclear radiation monitoring. In order to accurately analyze the impact of different source-detector distance, vacuum degree, placement angle and other factors on alpha energy spectrum measurement, we used Monte Carlo method to simulate energy spectrum measurement, thus reduced experiment time and improved the accuracy. The Monte Carlo method was used to establish chamber model for the PIPS-alpha spectrometer, which, by changing the distance between a radiation source and detector, simulates the alpha energy spectrum. The simulation results are corrected according to the experimental results to improve the degree of agreement between experiment and simulation. Experiments show that the Monte Carlo model is accurate and can be used for simulating the impact of different source-detector-distance, vacuum degree, placement angle and other factors on alpha energy spectrum measurement. This method not can only be applied to other alpha energy spectrum measurement, but also be used in single energy spectrum research of alpha particles. The study is to provide a basis for the alpha spectrum measurement technology and data support for alpha spectrum technology.
Keywords:PIPS-α spectrometer  Monte Carlo method  Gaussian broadening  detection efficiency  correlation coefficient
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