Abstract
A method for independently measuring the concentrations of 222 Rn decay products collected on a filter is described. The measurements utilise alpha and beta spectroscopy and use a special non-emanating source containing 2 26 Ra in equilibrium with its decay products for both energy and detection efficiency calibration. Internal conversion electrons from 137 Cs are used to establish the energy calibration for the beta spectrum to distinguish between 214 Pb and 214 Bi decays. The method has been applied to the investigation of self-absorption losses of alpha particles from 222 Rn decay products at different aerosol loading of the filters used to collect the 222 Rn progeny.
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