Absolute estimation of radon daughter concentrations in air by alfa-spectrometry

A method for the estimation of the concentration of radon daughter in air is given. The method is based on alfa spectrometric counting measurements performed either during or after the dust collection with an electrostatic precipitator. The relations between measured counts and concentrations in air of the collected nuclides (RaA, RaB and RaC) are obtained assuming a constant collection rate and a linear collection rate model. It turns out that the less sophisticated model gives more satisfactory estimations of the parameters