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MAP20071017539Edlin, D.W.Radon and thoron daughter working levels in British coalmines / D.W.Edlin, N.P. Crawford and J. DodgsonSumario: 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 siteEn: The Annals of occupational hygiene. - Oxford [etc.]. - nº 3, 1984 ; p. 315-3201. Higiene industrial. 2. Contaminantes químicos. 3. Radón. 4. Control de la contaminación. 5. Muestreos. 6. Minas de carbón. 7. Gran Bretaña. I. Crawford, N.P.. II. Dodgson, J.. III. Title. IV. Título: The Annals of occupational hygiene.