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Water samples containing sea-water, river water, reservoir water, drinking water and groundwater were examined by means of gamma ray spectral analysis. Only gamma emitters in 228U, 232Th and 40K series were detected. No fission products were detected with specific activity exceeding 1,0 Bq/kg. The present data could be a base line for future monitoring of radioactivity released from nuclear plants. The variation of specific activities detected may be related to geological differences and the effect of plants.