Methodology of indoor exposures assessment

A review of the indoor component of the radiation exposure is given based on the part of the UNSCEAR Report concerning the natural radiation sources. Different approaches for the components from the cosmic radiation and primordial radionuclides commented. The gamma radiation background has been studied in the past thoroughly and now these results can be exploited to manage the inherently related and most urgent but controllable indoor radon exposure. A sequence of causes of the radon problem is given beginning with the cosmic origin and ending with the potentiality of originating lung cancer and a hierarchy of related quantities is given. Modelling and theoretical studies of separable relations are useful and urgent, not so complex models. (author). 4 refs, 2 tabs