β辐射个人剂量当量Hp(3)次级标准电离室的设计与性能测试

辐射防护 ›› 2024, Vol. 44 ›› Issue (5): 454-460.

β辐射个人剂量当量H_p(3)次级标准电离室的设计与性能测试

李胤¹, 王川², 以恒冠¹, 刘新昊¹, 王桢¹, 段嘉宇¹

1.中国辐射防护研究院辐射安全与防护山西省重点实验室,太原 030006;
2.核电运行研究(上海)有限公司,上海 200126

收稿日期:2023-11-02 出版日期:2024-09-20 发布日期:2024-11-05
通讯作者: 以恒冠。E-mail:kidyhg1412@sina.com
作者简介:李胤(1995—),男,2017年毕业于湖北科技学院核工程与核技术专业,2020年毕业于兰州大学核技术及应用专业,获硕士学位,助理研究员。E-mail:liyin_cirp@163.com

Design and performance test of secondary standard ionization chamber for β radiation personal dose equivalent H_p(3)

LI Yin¹, WANG Chuan², YI Hengguan¹, LIU Xinhao¹, WANG Zhen¹, DUAN Jiayu¹

1. China Institute of Radiation Protection, Shanxi Provincial Key Laboratory of Radiation Safety and Protection, Taiyuan 030006;
2. Nuclear Power Operations Research Institute, Shanghai 200126

Received:2023-11-02 Online:2024-09-20 Published:2024-11-05

摘要/Abstract

摘要： 研发了β辐射个人剂量当量H_p(3)次级标准电离室,不同于主标准器外推电离室的外推结构设计,该电离室采取附带体模的平板电离室的结构,兼顾高测量精度(相对固有误差＜2.0%)的同时,简化试验流程。辐射性能试验结果表明:在β辐射公式_p(3)个人剂量当量率5~170 mSv/h内的相对固有误差不超过±1.5%;具备β辐射公式_p(3)个人剂量当量率0.5 mSv/h~1.5 Sv/h内至少5个量程的测量范围且相对固有误差不超过±4.0%;在β辐射±60°入射角下的响应相对偏差不超过±5%;电离室的测量重复性为0.6%;对⁹⁰Sr/⁹⁰Y源在30 cm处加展平过滤的测量相对扩展不确定度为U_rel= 3.9%(k = 2)。另外,实验发现,H_p(3)电离室对低能污染光子具有相对较高的响应。

关键词: β辐射, 个人剂量当量H_p(3)次级标准电离室, 相对固有误差, 角响应, 不确定度

Abstract: In this paper, a secondary standard ionization chamber for β radiation personal dose equivalent H_p(3) is developed. Different from the extrapolation structure design of the primary standard extrapolation ionization chamber, the secondary standard ionization chamber adopts the structure of a flat plate ionization chamber with a phantom, and takes into account high measurement accuracy (relative inherent error <2.0%) while greatly simplifying the complexity of the test process. The radiation performance test results show that relative inherent error within the individual dose equivalent rate of beta radiation H_p(3) from 5 mSv/h to 170 mSv/h does not exceed ±1.5%; with regard to beta radiation H_p(3), for measurement range of at least 5 orders within the personal dose equivalent rate of 0.5 mSv/h-1.5 Sv/h, the relative inherent error does not exceed ±4.0%; the relative deviation of the response under the incident angle of β radiation ±60° does not exceed ±5%; measurement repeatability of the ionization chamber is 0.6%; relative expanded uncertainty of the measurement with flattening filter at 30 cm for the ⁹⁰Sr/⁹⁰Y source is U_rel=3.9% (k=2). In addition, it was found experimentally that the H_p(3) ionization chamber has a relatively high response to low-energy contamination photons.

Key words: beta radiation, secondary standard ionization chamber for personal dose equivalent H_p(3), relative inherent error, angular response, uncertainty

中图分类号:

TL811+.1

李胤, 王川, 以恒冠, 刘新昊, 王桢, 段嘉宇. β辐射个人剂量当量H_p(3)次级标准电离室的设计与性能测试[J]. 辐射防护, 2024, 44(5): 454-460.

LI Yin, WANG Chuan, YI Hengguan, LIU Xinhao, WANG Zhen, DUAN Jiayu. Design and performance test of secondary standard ionization chamber for β radiation personal dose equivalent H_p(3)[J]. RADIATION PROTECTION, 2024, 44(5): 454-460.

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