时间间隔分析测量低浓度^(220)Rn的实验研究  

Experimental Study on Measurement of ^(220)Rn by Time Interval Analysis Method

作　　者：杨朝桐[1] 颜拥军[1] 付德顺 周剑良[1] 丘寿康[1] 

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001

出　　处：《原子能科学技术》2014年第9期1712-1717,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11175082);湖南省高校产业化培育资助项目(13CY014)

摘　　要：介绍了一种测量低浓度220 Rn的方法——时间间隔分析方法。220 Rn原子发生衰变发射α粒子并产生216Po时,在很短时间内,216Po衰变(半衰期0.145s)又发射α粒子。多时间分析方法就是对2个连续发射的α粒子的时间间隔进行分析,使220 Rn从222 Rn中分辨出来。本实验通过卢卡斯氡探测器(FD125)对10Bq的220 Rn标准源进行流气式测量。当222 Rn活度小于10倍左右220 Rn活度时,计数率控制在60min-1以内,时间分辨率设置为1ms,测量时间为10h,测量结果的相对偏差在7%内。T his paper introduced a measurement method of low concentration 220 Rn-time interval analysis （TIA） method .In the short time after the alpha particle emitted at the decay of a 220 Rn atom an alpha particle from the decay of 216 Po （half life 0.145 ） follows .The multi-time analysis method is based on the analysis of the emitting time interval between the two successive alpha particles ,which can be used to discriminate the 220 Rn from 222 Rn .A flow through Lucas cell （FD125） was used to measure 10 Bq standard 220 Rn source .When the 222 Rn activity is less than 10 times the 220 Rn activity , count rate is controlled within 60 min-1 ,the time resolution is set to 1 ms and the meas-uring time is 10 h ,and the relative deviation of the results is within 7% .

关 键 词：^220RN ^222RN 时间间隔分析方法 闪烁室探测器 

分 类 号：TL822[核科学技术—核技术及应用]