A method of measuring the working-level values of mixed radon and thoron daughters in coalmine air
The method is based on measuring the alpha-activity of shift-long respirable dust samples. Activity concentrations of a few thousandths of a working level are easily measured, and the value obtained is fairly close to a shift average. The sampling equipment used in trials was the MRE gravimetric dust sampler, which is safe for use in methane-air mixtures, and in British coal mines the measurements can be made on routine respirable dust samples.
Publication Number: P/035
First Author: Ogden TL
Publisher: Oxford University Press,Oxford University, Oxford,Oxford
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