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Radon and thoron daughter working levels in British coalmines

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      <subfield code="a">Edlin, D.W.</subfield>
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      <subfield code="a">Radon and thoron daughter working levels in British coalmines</subfield>
      <subfield code="c">D.W.Edlin, N.P. Crawford and J. Dodgson</subfield>
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      <subfield code="a">Shift-average radon and thoron daughter working levels have been measured at 11 collieries in the U.K. Levels were low (generally less than 20 milli-working levels) compared with those typical of uranium mines. The possible influences of various factors on the level of activity were examined, but a correlation was found only with ventilation distances from pit bottom to the sampling site</subfield>
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      <subfield code="t">The Annals of occupational hygiene</subfield>
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      <subfield code="g">nº 3, 1984 ; p. 315-320</subfield>
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