ABSTRACT
Epidemiologic follow-up studies of 13 mining groups show a lung cancer dose response that increases with increasing radon concentration. Combined with this fact and
that some homes can attain the concentrations that exist in mines, interest was spurred in environmental measurements, and their risk estimates. The global environmental measurements to date are described, showing that the current indoor home environment averages about 40 Bq m3 (about 1 pCi l1). An emerging problem in radon gas measurement is the presence of 220Rn (thoron), often unaccounted for, and this undoubtedly affects the existing calculated risk estimates for homes. There are many domestic follow-up studies that try to link home exposure with lung cancer risk from radon, but so far no study has clearly defined a precise risk that could be used in domestic risk assessment.
