Abstract
IN recent years, interest has been renewed in the measurement of the radon content of the atmosphere1–4. In most cases, samples of air were drawn through fine grain filter papers and the activity of the filter-paper samples, corresponding to radium A, B and C, was afterwards estimated by a suitable Geiger–Müller counter and scaling system. It was, however, found that the filter paper method had a low collection efficiency of only 2–3 per cent as compared with the less equivocal ion chamber method1. Furthermore, Běhounek and Majerová5 reported that there was no reason for assuming the ratio between the two measurements to be constant.
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BANERJI, P., CHATTERJEE, S. Radon Content of Rainwater. Nature 204, 1185–1186 (1964). https://doi.org/10.1038/2041185c0
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DOI: https://doi.org/10.1038/2041185c0
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