Analysis of atmospheric concentrations of RaA, RaB, RaC by alpha spectroscopy.

Presents a new method for determining the airborne concentrations of RaA, RaB and RaC in atmospheres contaminated with radon-222. The method employs alpha spectroscopy to measure the count rates of RaA and RaC' present on a membrane filter sample at two post-sampling times. The individual air concentrations and the statistical variances associated with each may then be calculated from the equations given. Presents theoretical and experimental comparisons which indicate the improved accuracy of the spectroscopic method over methods previously available.