基于极低本底γ谱分析的海水直接测量研究

辐射防护 ›› 2019, Vol. 39 ›› Issue (6): 456-462.

基于极低本底γ谱分析的海水直接测量研究

米宇豪^1,2, 马豪^2,3, 曾志^2,3, 何建华⁴, 程建平⁵

1.生态环境部核与辐射安全中心,北京 100082;
2.清华大学工程物理系,北京 100084;
3.清华大学粒子技术与辐射成像教育部重点实验室,北京 100084;
4.国家海洋局第三海洋研究所,福建厦门 361005;
5.北京师范大学,北京 100875

收稿日期:2018-12-18 出版日期:2019-11-20 发布日期:2020-05-15
通讯作者: 曾志。E-mail:zengzhi@tsinghua.edu.cn
作者简介:米宇豪(1991—),男,2012年毕业于四川大学物理学院核工程与核技术专业,2017年毕业于清华大学工程物理系核科学与技术专业,获博士学位,工程师。E-mail: miyuhao@foxmail.com

Study on direct seawater measurement by ultra-low background gamma spectrometry

MI Yuhao^1,2, MA Hao^2,3, ZENG Zhi^2,3, HE Jianhua⁴, CHENG Jianping⁵

1. Nuclear and Radiation Safety Center, MEE, Beijing 100082;
2. Department of Engineering Physics,Tsinghua University, Beijing 100084;
3. Key Laboratory of Particle &Radiation Imaging(Tsinghua University), Ministry of Education, Beijing 100084;
4. Third Institution of Oceanography,State Oceanic Administration, Fujian Xiamen 361005;
5. Beijing Normal University, Beijing 100875

Received:2018-12-18 Online:2019-11-20 Published:2020-05-15

摘要/Abstract

摘要： 为实现便捷、灵敏的海水放射性测量,建立了基于中国锦屏地下实验室低本底高纯锗γ谱仪GeTHU的海水直接测量方法。使用GeTHU直接测量了分别来自西太平洋及上海、青岛、厦门近岸海域的4个体积均接近8.8 L的海水样品,约18小时的直接测量能够探测到⁴⁰K及来自²³⁸U、²³²Th天然放射系的一些关键放射性核素。基于GeTHU的直接测量方法对人工放射性核素同样具有较好的灵敏度,⁵⁷Co、¹³¹I、¹³⁴Cs、¹³⁷Cs的最小可探测活度浓度经过12小时的测量可以降低到25 mBq/L以下,其中¹³⁷Cs的最小可探测活度浓度在48小时的测量后可以达到约8.6 mBq/L。GeTHU将会被持续用于海水放射性的直接测量,尤其是用于需要测量大量样品的紧急监测任务。

关键词: 直接测量, 放射性, 海水, 低本底, GeTHU, 中国锦屏地下实验室

Abstract: In order to realize the convenient and sensitive measurement of radioactivity in seawater, the direct measurement method is established based on the low background HPGe gamma spectrometer GeTHU in China Jinping underground Laboratory (CJPL). 4 nearly 8.8 L seawater samples from the western Pacific Ocean and the coastal waters of Shanghai City, Qingdao City, Xiamen City respectively are directly measured by GeTHU, and the 18-hour measurement can detect ⁴⁰K as well as some key radionuclides from the ²³⁸U and ²³²Th decay chains. The method with GeTHU also shows an excellent sensitivity to artificial radionuclides. The MDACs for ⁵⁷Co, ¹³¹I, ¹³⁴Cs and ¹³⁷Cs can drop below 25 mBq/L after 12 hours and the MDAC for ¹³⁷Cs is ~8.6 mBq/L after 48 hours. GeTHU will be continuously dedicated in direct measurements of radioactivity in seawater, especially for the urgent monitoring task with massive samples.

Key words: direct measurement, radioactivity, seawater, low background, GeTHU, CJPL

中图分类号:

R144

米宇豪, 马豪, 曾志, 何建华, 程建平. 基于极低本底γ谱分析的海水直接测量研究[J]. 辐射防护, 2019, 39(6): 456-462.

MI Yuhao, MA Hao, ZENG Zhi, HE Jianhua, CHENG Jianping. Study on direct seawater measurement by ultra-low background gamma spectrometry[J]. RADIATION PROTECTION, 2019, 39(6): 456-462.

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