Radon and thoron working levels from ordinary industrial-hygiene dust samples

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      <subfield code="a">The method is an improvement of that of Ogden, and has the following advantages over other methods: the measurements do not require special samples, but can be made on ordinary airborne dust samples; the long sampling time is more suitable for stimating average exposure than the conventional short sample; radon and thoron working levels are both obtained; and the method is very sensitive. Side-by-side comparisons show good agreement with other methods</subfield>
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      <subfield code="t">The Annals of occupational hygiene</subfield>
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      <subfield code="g">nº 1, July 1977 ; p. 49-53</subfield>
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