Abundance of U-236 in nature

Details Abundance of U-236 in nature Abundance of U-236 in nature

Jun 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26..681d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 26, Issue 6, pp.681-684

Physics

Scientific paper

Upper limits of less than one part per billion have been established by mass spectrometry for U-233, U-236, and U-237 isotopes in uranium from samples of Belgian Congo pitchblende and Colorado Carnotite. The new upper limit of one-half part per billion U-236 in the pitchblende is smaller than would be expected from the measured Pu-239:U-238 ratio of 2·8 × 10 12 in the ore, assuming the Pu-239 was formed exclusively by capture of thermal neutrons; and much smaller than would be expected from previous plutonium assays of Belgian Congo pitchblende samples.

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