液闪萃取法测量水中镭-226的分析方法研究

辐射防护 ›› 2024, Vol. 44 ›› Issue (S1): 41-45.

液闪萃取法测量水中镭-226的分析方法研究

郭琛, 杨海兰, 杨有坤, 保莉, 苟荣霞, 王瑞俊, 廉冰

中国辐射防护研究院国家环境保护辐射环境与健康重点实验室,太原 030006

收稿日期:2023-11-23 出版日期:2024-11-20 发布日期:2024-12-26
作者简介:郭琛(1995—),男,2018年毕业于哈尔滨工程大学核化工与核燃料循环专业,获工学学士学位,2021年毕业于哈尔滨工程大学核能与核技术工程专业,获工程硕士学位,助理研究员。E-mail:www.18004516503@163.com

Analytical method study for the determination of radium-226 in water by liquid scintillation counting

GUO Chen, YANG Hailan, YANG Youkun, BAO Li, GOU Rongxia, WANG Ruijun, LIAN Bing

China Institute for Radiation Protection, Key Laboratory of Radiation Environment & Health of the Ministry of Ecology and Environment, Taiyuan 030006

Received:2023-11-23 Online:2024-11-20 Published:2024-12-26

摘要/Abstract

摘要： 本文研究了水中镭-226的液体闪烁计数器测量方法,通过非水溶性闪烁液将镭-226的子体氡-222从水样中萃取进入闪烁液中,实现氡-222与水中其他干扰核素的分离。当镭-226与它的子体达到平衡后,通过液体闪烁计数器进行α/β甄别测量,测量氡-222、钋-218、钋-214的总α计数,间接得到水相中镭-226的活度浓度。结果表示:液闪对水中镭-226测量的淬灭很小,Quantulus 1220型液体闪烁计数器对本方法的测量本底为0.02 min^-1,测量效率在2.52~2.60之间,探测下限小于2 mBq/L,可以满足实际环境样品中镭的测量需求。

关键词: 液闪, 镭-226, α/β甄别测量

Abstract: This paper studies a liquid scintillation counter measurement method for radium-226 in water. The method extracts radon-222, a daughter of radium-226, from water sample and enters into scintillation solution by means of insoluble scintillation liquid, thus realizes the separation of radon-222 from other interfering nuclides in water. After a period of time, when radium-226 and its daughter reached equilibrium, alpha/beta discrimination measurement was carried out by liquid scintillation counter to separate radon-222 and its alpha emmision daughters polonium-218 and polonium-214 from the beta emmision daughters bismuth-214 and lead-210, and indirectly obtains the activity concentration of radium-226 in the aqueous phase through the measurement of total alpha counts of radon-222, polonium-218 and polonium-214. The results indicated that the quench of liquid scintillation on the measurement of radium-226 in water is very low, and the Quantulus 1220 liquid scintillation counter has a measurement background of 0.02 cpm for this method, with a measurement efficiency of 2.52-2.60 and a minimum detection level of less than 2 mBq/L, which can meet the requirement for the measurement of radium in environmental samples.

Key words: LSC, radium-226, alpha/beta discrimination measurement

中图分类号:

O661.1

郭琛, 杨海兰, 杨有坤, 保莉, 苟荣霞, 王瑞俊, 廉冰. 液闪萃取法测量水中镭-226的分析方法研究[J]. 辐射防护, 2024, 44(S1): 41-45.

GUO Chen, YANG Hailan, YANG Youkun, BAO Li, GOU Rongxia, WANG Ruijun, LIAN Bing. Analytical method study for the determination of radium-226 in water by liquid scintillation counting[J]. RADIATION PROTECTION, 2024, 44(S1): 41-45.

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