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Document ID (ISN)24748
CIS number 76-411
ISSN - Serial title 0002-8894 - American Industrial Hygiene Association Journal
Year 1975
Convention or series no.
Author(s) George A.C., Hinchliffe L., Sladowski R.
Title Size distribution of radon daughter particles in uranium mine atmospheres.
Bibliographic information June 1975, Vol.36, No.6, p.484-490. Illus. 26 ref.
Abstract The size distribution of radon daughters was measured in several uranium mines using 4 compact diffusion batteries and a round jet cascade impactor. Simultaneously, measurements were made of uncombined fractions of radon daughters, radon concentration, working level and particle concentration. The size distributions found for radon daughters were log normal. The activity median diameters ranged from 0.09 to 0.3Ám (mean 0.17Ám). Uncombined fractions expressed in accordance with the ICRP definition ranged from 0.004 to 0.16 (mean 0.04). The radon daughter sizes in these mines are greater than those assumed by various authors in calculating respiratory tract dose. The disparity may reflect the widening use of diesel-powered equipment in large uranium mines. Before generalisations can be made about the size distribution of radon daughters, the environmental characteristics of uranium mines must be studied individually.
Descriptors (primary) airborne dust; uranium mining; radon daughters; particle size distribution
Descriptors (secondary) workplace monitoring; sampling instruments; radon; cascade impactor sampling
Document type -
Subject(s) Radiation
Broad subject area(s)
Browse category(ies) Radon
Mining and quarrying
Inorganic substances