Radiocesium levels in Irish Sea fish and the resulting dose to the population of the Irish Republic.

Discharges of radioactive materials from the nuclear fuel reprocessing plant at Sellafield in the United Kingdom give rise to 137Cs and 134Cs in fish caught in the Irish Sea. Measurements made on fish catches landed in the Irish Republic show average activities of 68 and 3 Bq/kg (wet) of 137Cs and 134Cs, respectively. The estimated population dose to the Irish public is approximately 2 man-Sv y-1 and the possible dose to a member of the critical group is 1.4% of the limit recommended by the International Commission on Radiological Protection.