[en] Measurements of fallout radioactivity in the North Atlantic region including the Faroe Islands and Greenland are reported. Strontium-90 and cesium-137 were determined in samples of precipitation, sea water, vegetation, various foodstuffs (including milk in the Fareos) and drinking water. Estimates are given of the mean contents of 90Sr and 137Cs in human diet in the Faroes and Greenland in 1986. A few 99Tc data on marine samples are reported. Data on plutonium and americium in sediments and biota collected at Thule in 1984 are presented. (author)