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MAP20071017148Ogden, T.L.Radon and thoron working levels from ordinary industrial-hygiene dust samples / T.L. OgdenSumario: 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 methodsEn: The Annals of occupational hygiene. - Oxford [etc.]. - nº 1, July 1977 ; p. 49-531. Higiene industrial. 2. Contaminantes químicos. 3. Radón. 4. Control de la contaminación. 5. Métodos de análisis. 6. Muestreos. 7. Medicina laboral. I. Título. II. Título: The Annals of occupational hygiene.