The effect of geological and geographicalfeatures on environmental radiation

摘要

The gamma-ray dose rates were measured in Gifu and Tokushima Prefectures in Japan.Measurements were carried out by the car-borne survey method. The dose rate in basaltic terrain inTokushima prefecture was almost same as average of basaltic terrain in Japan. On the other hand, thedose rate in basaltic terrain in Gifu Prefecture was not same. In situ measurement of terrestrial gamma-ray dose rate was carried out in this terrain to examine its cause. As a result, it was estimated that soil ofrhyolite which attributed to neighbor terrain have deposited on this terrain.