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Published on: May 3, 2019
Measurement of thoron gas in the environment using a Lucas scintillation cell
Abstract:
A simple and fast method for measuring the concentration of (220)Rn 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 (220)Rn 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 (220)Rn 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 (220)Rn or mixed (222)Rn/(220)Rn environments the deviations were less than ± 10%. This method can also be used for quantitative measurement of (220)Rn concentration.
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