Radon dosimetry and its implication for risk

This paper re-examines these two approaches, and the likely uncertainties associated with each, in the light of recent scientific knowledge. Recent risk estimates using the epidemiological approach (∼5×10−4/WLM) are nearly twice those made in 1994, while a recent detailed analysis using the dosimetric approach gives a risk about 15% lower than the 1994 study (∼7×10−4/WLM). Based on these current estimates, the two approaches are broadly consistent. It is observed that a small change in the weighting factor for the lung, from 0.12 (rounded by ICRP from 0.11) to 0.10 is all that is needed to make these two approaches agree almost exactly.