基于Geant4模拟<sup>37</sup>Ar活度测量计数损失的修正方法

doi:10.13491/j.issn.1004-714X.2023.02.001

中国辐射卫生

2023, Vol. 32

Issue (2): 93-97,101 DOI: 10.13491/j.issn.1004-714X.2023.02.001

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基于Geant4模拟³⁷Ar活度测量计数损失的修正方法

孔淑颖¹, 杨宝路¹, 王仁生², 张明³, 路天翔¹, 拓飞¹

1. 中国疾病预防控制中心辐射防护与核安全医学所，北京 100088;
2. 苏州大学医学部放射医学与防护学院，江苏苏州 215123;
3. 中国计量科学研究院，北京 100029

Counting loss correction in ³⁷Ar activity measurement based on Geant4 simulation

KONG Shuying¹, YANG Baolu¹, WANG Rensheng², ZHANG Ming³, LU Tianxiang¹, TUO Fei¹

1. National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088 China;
2. School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou 215123 China;
3. National Institute of Metrology, Beijing 100029 China

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摘要目的采用内充气正比计数器开展放射性惰性气体³⁷Ar活度绝对测量时，需要对计数器阈值以下的计数损失进行修正。方法利用Geant4蒙特卡罗模拟软件，构建正比计数器模型并获得³⁷Ar能量沉积谱，模拟分析计数损失产生原因及修正方法。结果模拟计数器工作压强60 kPa下对光子探测效率，结果仅为38.7%，漏计数损失主要来源于光子逃逸产生的壁效应，可通过增大工作气体压强的方式减小，并通过外推的方式予以修正。模拟压强100 kPa下，壁效应影响为4.4%，与实验偏差在0.6%以内。结论可利用Geant4确定计数器阈值以下漏计数修正因子，从而实现正比计数器法对³⁷Ar活度的准确测量。

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关键词 ： ³⁷Ar, Geant4, 正比计数器, 探测效率, 计数损失修正

收稿日期: 2022-09-08

PACS:

TL811

通讯作者: 拓飞，E-mail：flytuo@163.com E-mail: flytuo@163.com

作者简介: 孔淑颖（1999—），女，山东枣庄人，在读硕士研究生，研究方向为辐射检测与评价。E-mail：549830208@qq.com

引用本文:

孔淑颖, 杨宝路, 王仁生, 张明, 路天翔, 拓飞. 基于Geant4模拟³⁷Ar活度测量计数损失的修正方法[J]. 中国辐射卫生, 2023, 32(2): 93-97,101.
KONG Shuying, YANG Baolu, WANG Rensheng, ZHANG Ming, LU Tianxiang, TUO Fei. Counting loss correction in ³⁷Ar activity measurement based on Geant4 simulation. Chinese Journal of Radiological Health, 2023, 32(2): 93-97,101.

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