Size distribution, equilibrium ratio and unattached fraction of radon decay products under typical indoor domestic conditions

In order to characterise the behaviour of radon decay products under domest ic conditions, long-term measurements were carried out from May 1997 to Apr il 1998 in a typical dwelling located in Brittany (France). In particular, the unattached fraction and equilibrium factor were continuously measured. Moreover, the size distributions of unattached and attached radon daughters were investigated by using specific instruments implemented in the laborat ory. All these experiments were carried out under different typical aerosol conditions. The results evidenced the strong influence exerted by the char acteristics (concentration, size) of ambient aerosol on these different par ameters. (C) 2001 Elsevier Science B.V. All rights reserved.