Abstract

Terrestrial gamma-ray dose rates have been measured outdoors throughout the region of Cantabria, located in the north of Spain. Results obtained are shown in tabular and cartographical form and are related to the nature of the ground and other influencing factors. The mean absorbed dose rate in air outdoors is 35.46 nGy h-1. The mean annual effective dose equivalent, when the duration of outdoor exposure and distribution of the population are considered, is about 32 mu Sv. This dose is in addition to those doses received from other sources of natural radiation, principally from the presence of radon gas indoors.

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