氡子体活度浓度测量系统的研究  

Research on radon daughters activity measurement system

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作  者:冯佳璐 何正忠[1] 王可欣[1] 敖韬 刘宇凡 FENG Jialu;HE Zhengzhong;WANG Kexin;AO Tao;LIU Yufan(University of South China,Hengyang,420000,China)

机构地区:[1]南华大学,氡湖南省重点实验室,衡阳421001

出  处:《核电子学与探测技术》2025年第3期334-342,共9页Nuclear Electronics & Detection Technology

基  金:国家自然科学基金:项目No.12175102;湖南省自然科学基金:项目No.2022JJ40346。

摘  要:氡是天然内照射的主要来源,氡的危害主要来自氡子体,因此,准确测量环境中氡子体活度浓度对评价氡暴露危害尤为重要。依托南华大学氡实验室,设计了一款氡子体活度浓度测量系统,该系统通过采样装置将氡子体气溶胶取样至滤膜,采用PIPS探测器直接测量滤膜收集的氡子体α衰变信息,通过α能峰计数计算氡子体活度浓度值。对能峰重叠因子、滤膜过滤效率及自吸收因子三个系统关键参数进行测量,经过整体性能测试,达到设计要求。测试结果表明,测量系统对^(241)Am源与不同氡子体的峰位变化率均小于1%,可以实现不同氡子体活度浓度的可靠测量。该系统重量轻,携带方便,可搭载在其他装备上,方便在复杂环境下使用。Radon is the main source of natural internal irradiation,and the exposure risk of radon mainly comes from radon daughters.Therefore,accurate measurement of radon daughters activity concentration in the environment is particularly important for evaluating the hazard of radon exposure.Relying on the Radon Laboratory of the University of South China,a radon daughters activity measurement system is designed,which samples the radon daughters aerosol to the filter membrane through a sampling device,directly measuresα-decay information from the radon daughters collected by the filter membrane using a PIPS detector,and calculates the radon daughters activity concentration value throughα-energy peak counting.Three key parameters of the system,namely:energy peak overlap factor,filter membrane filtration efficiency and self⁃absorption factor,were measured.After the overall performance test,the design requirements were met.The test results show that the peak position change rate of ^(241)Am source and different radon daughters is less than 1%,which can achieve reliable measurement of activity concentration of different radon daughters.The system is light-weighted and easy to carry.It can be mounted on other equipment,which is convenient to use in complex environments.

关 键 词:氡室 氡子体 PIPS探测器 α能谱法 滤膜 

分 类 号:TL817[核科学技术—核技术及应用]

 

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