Two hundred and forty samples of radon (222Rn) gas concentration, together with unattached and attached-to-ambient-aerosol radon progeny concentrations, were collected at 16 outdoor sites in four US states.
The effective dose rate (to the lungs) was calculated with ICRP's recently recommended lung dosimetry model (ICRP Publication 66) using the measured potential alpha energy concentration (PAEC) and unattached fraction (fP).
The measurement procedure for fP assumed a characteristic particle diameter of 1.1 nm for the unattached progeny.
The site-average value of the conversion coefficient between radon gas concentration and effective dose rate was found to be 6.7 nSv. h-1 per Bq. m-3, with a standard deviation of 1.3 nSv. h-1 per Bq. m-3.
The correlation coefficient (r) of effective dose rate with respect to radon gas concentration between these 16 sites was 0.98.
Thus, the radon gas concentration alone was a good predictor of effective dose rate in outdoor air, at least when the dose calculation was based on a known PAEC and the assumption of discrete unattached and attached particle size modes.
For an average outdoor occupancy of 5 h. d-1 together with the average radon gas concentration, the annual effective dose rate averaged for outdoor exposure at these 16 sites was approximately 80 muSv. y-1, with a median value of 54 muSv. y-1 and a geometric standard deviation between sites of about 1.9.
Mots-clés Pascal : Etats Unis, Radon, Gaz, Etude en condition extérieure, Homme, Dosimétrie, Poumon, Etude comparative, Répartition spatiale, Est, Ouest, Paramètre, Epidémiologie, Amérique du Nord, Amérique
Mots-clés Pascal anglais : United States, Radon, Gases, Outdoor study, Human, Dosimetry, Lung, Comparative study, Spatial distribution, East, West, Parameter, Epidemiology, North America, America
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0411630
Code Inist : 002B30A02A. Création : 01/03/1996.