In this paper, model calculations were used to predict the external gamma dose rate and indoor 222Rn concentration inside a typical dwelling found in Hong Kong.
The radionuclide contents in the building materials were taken from previous measurements.
The equivalent gamma dose rate inside the room built of concrete was computed to be about 0.95 mSv. y-1 which was in good agreement with a previously measured population-weighted mean equivalent gamma dose rate of 0.93 mSv.y. This value was a few times higher than the reported values in European countries.
Addition of fly ash to the concrete has only a slight effect in the gamma dose rate.
The computed indoor 222Rn concentration also agreed with the arithmetic mean of 42 Bq. m-3 obtained in a previous survey.
The seasonal variation of indoor 222Rn concentration was predicted by considering the change in ventialtion and meteorological conditions.
Based on the predcted values, the excess lung cancer cases attributable to indoor 222Rn was estimated to be 201 and 67 for men and women respetively.
Mots-clés Pascal : Radioisotope, Exposition, Matériau construction, Homme, Logement habitation, Chine, Modèle mathématique, Irradiation gamma, Installation intérieure, Tumeur maligne, Poumon, Facteur risque, Asie, Poumon pathologie, Appareil respiratoire pathologie
Mots-clés Pascal anglais : Radioisotope, Exposure, Construction materials, Human, Housing, China, Mathematical model, Gamma irradiation, Indoor installation, Malignant tumor, Lung, Risk factor, Asia, Lung disease, Respiratory disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0340942
Code Inist : 002B30A02B. Création : 01/03/1996.