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Science 28 July 1967:
Vol. 157. no. 3787, pp. 425 - 427
DOI: 10.1126/science.157.3787.425
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Articles

Europium-155 in Debris from Nuclear Weapons

A. Aarkrog 1 and J. Lippert 1

1 Danish Atomic Energy Commission, Research Establishment Risö, Roskilde, Denmark

The lithium-drifted germanium detector enables determination of europium-155 on a routine basis in environmental samples contaminated with debris from nuclear weapons. From measurements of europium-155, cesium-144, and strontium-90 in air filters collected between 1961 and 1966, the yield of europium-155 from weapons was estimated at 1400 atoms per 106 fissions, which is close to the yield of europium-155 from fast fission of uranium-238.

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