基于极低本底γ谱分析的海水直接测量研究

Abstract

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

CLC Number:

R144

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

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