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Science 2 December 1977:
Vol. 198. no. 4320, pp. 925 - 927
DOI: 10.1126/science.198.4320.925
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Articles

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

LARS-ERIK DE GEER 1

1 National Defense Research Institute, S-104 50 Stockholm 80, Sweden

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.

Submitted on July 5, 1977
Revised on September 7, 1977

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Science. ISSN 0036-8075 (print), 1095-9203 (online)