Abstract
A cloud of fresh, highly fractionated fission products was observed in Finland between December 21 and 26, 1966. They seemed to come from Central Asia and were probably the product of an underground nuclear test.
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KAURANEN, P., KULMALA, A. & MATTSSON, R. Fission Products of Unusual Composition in Finland. Nature 216, 238–241 (1967). https://doi.org/10.1038/216238a0
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DOI: https://doi.org/10.1038/216238a0
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