External Radiation Doses to the Norwegian Population from the Chernobyl Fall-out

In this paper calculations of external radiation doses to the Norweigan population from the Chernobyl fall-out are presented. These calculations are based on indoor TLD measurements performed in about 900 randomly selected houses in the south eastern part of Norway in the first and the sixth month after the accident, and surface activity data based on measurements of soil samples from each municipality of the country. The per caput effective dose equivalent in the first month and the first year were found to be 14 µSv and 82 µSv respectively. In Øystre Slidre, the municipality of Norway most heavily contaminated, the per caput effective dose equivalents in the first month and the first year were found to be 0.29 mSv and 1.7 mSv respectively. On average the shielding factors of Norwegian houses for the first and the sixth months were found to be 0.50 and 0.29 respectively.