Airborne Short-Lived Radionuclides of Unknown Origin in Sweden in 1976

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Science  02 Dec 1977:
Vol. 198, Issue 4320, pp. 925-927
DOI: 10.1126/science.198.4320.925


On five occasions during the first half of 1976 traces of neptunium-239 and molybdenum-99 were detected in southern Sweden. These activities were accompanied by small amounts of fission products such as iodine-131 and barium-140. One of the events was coincident in time with large peaks in the atmospheric tritium gas concentration.