Measurement of the unattached fraction of Rn-222 progeny using wire screens

A method for the measurement of the unattached radon progeny based on the e lectrostatic deposition on wire screens has been implemented and calibrated , using only one sampling pump. The importance of being able to measure the short-lived radon progeny resides in the special radiological significance that the unattached fraction has. It was possible to apply this measuremen t method to several dwellings of Argentina and then, have an estimated valu e of the unattached fraction under different aerosol source conditions. The remarkable aspect of this method is its simplicity, not only in the sample collection equipment used, but also in the measurement instruments, as wel l as the counting protocols that are simple and fast.