Measurement of thoron gas in the environment using a Lucas scintillation cell
Measurement of thoron gas in the environment using a Lucas scintillation cell
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DOI：
10.1088/0952-4746/30/3/013
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发表时间：
2010-09
影响因子：
1.5
通讯作者：
Lei Zhang;Jian Wu;Q. Guo;W. Zhuo
中科院分区：
文献类型：
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作者：
Lei Zhang;Jian Wu;Q. Guo;W. Zhuo
以AB-5型便携式氡测量仪为基础，建立了一种简单、快速的环境中220Rn浓度测量方法。首先用卢卡斯闪烁池（Lucas闪烁cell， LSC）测量背景计数，然后立即开始空气采样测量，持续1 min；通过采样前后的计数和理论检测效率可以计算出220Rn的浓度。理论计算结果表明，在纯220Rn环境下，LSC的检测下限约为65 Bq m−3（置信水平为70%）。实验结果表明，在纯220Rn或222Rn/220Rn混合环境下，与RAD7监测仪相比，偏差小于±10%。该方法也可用于220Rn浓度的定量测定。
A simple and fast method for measuring the concentration of 220Rn in the environment was developed based on the AB-5 portable radon measuring device. First, background counts were measured with a Lucas scintillation cell (LSC), then air sampling measurement was started immediately and lasted for 1 min; the 220Rn concentration could be calculated from the counts before and after sampling as well as the theoretical detection efficiency. Results of theoretical calculations showed that in a pure 220Rn environment the lower detection limit of the LSC would be some 65 Bq m−3 (with a confidence level of 70%). The experimental results showed that compared with a RAD7 monitor in pure 220Rn or mixed 222Rn/220Rn environments the deviations were less than ± 10%. This method can also be used for quantitative measurement of 220Rn concentration.