Abstract
THE first quantitative measurements on the formation of fission products in thermal neutron bombardment of uranium were made by Anderson, Fermi and von Grosse1. The fission yield of a fission isotope is the probability of the isotope being formed per thermal neutron fission. In bombardment, the rate of production of any active isotope from fission, that is, the fission rate multiplied by the fission yield, is equal to the disintegration rate of the active isotope referred to saturation of bombardment for the isotope. Thus data required for measurement the fission yield of an active fission isotope are: (a) number of fissions occurring in a given sample per unit time; and (b) disintegrations per unit time of the isotope referred to saturation of bombardment.
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References
Anderson, H., Fermi, E., von Grosse, A., Phys. Rev., 59, 52 (1941).
Grummitt, W. E., Gueron, J., Wilkinson, G., Yaffe, L., unpublished work (Montreal, 1944).
Elliott, L. G., unpublished work (Montreal, 1945).
Thode, H. G., Graham, R. L., Harkness, A. L., unpublished work (Hamilton, Ont., 1945).
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GRUMMITT, W., WILKINSON, G. Fission Products of U235. Nature 158, 163 (1946). https://doi.org/10.1038/158163a0
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DOI: https://doi.org/10.1038/158163a0
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