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Radiation Protection Dosimetry 82:193-200 (1999)
© 1999 Oxford University Press

A Stratified Approach to Individual Dosimetry for Radon Daughters in Mines

D.W. Dixon

Measurements of radon daughter concentrations in some mines suggest that exposures in certain cases might routinely approach the exposure standards of 4 WLM.y-1 recommended by ICRP. This paper discusses the options for individual dosimetry and the principles behind three popular methods of exposure estimation viz. personal dosemeter for radon daughters, personal dosemeter for radon gas coupled with knowledge of equilibrium factor, and time-weighted area monitoring. It is concluded that there can be considerable technical benefit in favouring radon gas personal dosemeters over dosimetry based on area monitoring. Evidence is presented to show that area monitoring data often leads to overestimates of exposure, and personal monitoring usually leads to more realistic estimates of individual exposure. The degree of overestimation by area monitoring is quantified and used to propose a basis for designing a practical but focussed programme of personal dosimetry with the highest priority being given to reliable dosimetry for miners with the highest exposures.


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[Abstract] [Full Text]


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