A Method for Determining Relative Amounts of Combined and Uncombined Radon Daughter Activity in Underground Uranium Mines

Abstract
A method for determining relative amounts of “uncombined” radon daughter decay products has been developed. Because of the different diffusion coefficients of atomic-size radon daughter products compared with those combined with particulates, a diffusion tube will separate out a calculable fraction of the atomic-size daughter products and permit larger particulates to pass through the tube. Data obtained from samples collected at several active underground working faces indicate substantial amounts of highly mobile radon daughter alpha activity.

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