Sammenligning af matematiske modeller til beregning af eksterne gammadoser hidrørende fra radioaktivitetsfrigørelser til atmosfæren

A brief discription is given of different mathematical models for estimating external gamma doses from a continuous plume of radioactive gases (iodines and noble gases) released to the atmosphere from a nuclear plant, and the uncertainties of such estimates are discussed. Gamma doses from unit releases of fourteen noble gases and iodines were calculated from these models and compared with the doses calculated from the computer program GDOS which is an implementation of a gamma dose model developed in the health physics department. Good agreement was found between GDOS and seven other models one of which was experimentally verified within a distance downwind of a few
kilometres. Estimated gamma doses from unit releases of fourteen noble gases and iodines for two weather categories (Pasquill types D and F) and with three different release heights (0, 2k and 100 metres) calculated with four of the models (including GDOS) are given tabularly and graphically for values of downwind distances from 0.1 to 50 kilometres.