This study measured the dose rate in air in the dwellings of 350 persons, selected randomly from the central population register of Finland.
TLD dosemeters were employed for half-year measurements in 1991.
Additionally, the results were compared with outdoor gamma radiation calculations based on data from a previous survey conducted in 1978-80.
The absorbed dose rate in air in low-rise residential buildings and in blocks of flats had ranges of 24-144 nGy. h-1 and 45-184 nGy. h-1, respectively, the population weighted mean values being 58 and 100 nGy. hs-1.
The weighted mean for the total population was 73 nGy. h-1.
In the figures given, the dose rate due to cosmic radiation, 32 nGy. h-1, was substracted.
The population weighted mean trerrestrial dose rate outdoors was 71 nGy. h-1.
In houses and in flats the mean indoor/outdoor dose rate ratios were 0.84 and 1.33 respectively.
This gave a population weighted mean for this ratio of 1.00.
A statistically significant increase caused by the Chernobyl fallout was observed, these results being in agreement with shielding factor studies.
This increment due to the Chernobyl fallout, which was substracted, was 0.3-19 nGy. h-1, on average 3 nGy. h-1.
The national annual average effetive dose due to natural terrestrial radiation was 0.45 mSv and owing, in 1991, to the Chernobyl fallout 0.03 mSv.
Mots-clés Pascal : Dosimétrie, Logement habitation, Air, Homme, Finlande, Etude en condition extérieure, Installation intérieure, Etude comparative, Irradiation gamma, Europe
Mots-clés Pascal anglais : Dosimetry, Housing, Air, Human, Finland, Outdoor study, Indoor installation, Comparative study, Gamma irradiation, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0341474
Code Inist : 002B30A02A. Création : 01/03/1996.