Abstract
The cumulative yields of sixteen mass chains in the fission of 233U by fission-spectrum neutrons were determined by radiochemical methods. The mass chains were mostly in the rare earth region of the yield curve. In general, the last radioactive member of the mass chain was isolated and its activity measured relative to the activity of 99Mo. With this ratio, with pertinent data from the thermal neutron fission of 235U, and with the absolute yield of mass 99 in the fission-spectrum neutron fission of 233U, the chain yield was calculated. The accuracy of the determinations is estimated to be ± 15 per cent, except for mass 161 where it is estimated to be ±30 per cent. The mass-yield curve for the fission-spectrum neutron fission of 233U was outlined by reflecting the yield values with the assumption that the average number of neutrons emitted per fission was 2·5. The mass yields in the fission-spectrum neutron fission of 233U differed from the mass yields in the thermal neutron fission of 233U in a manner analogous to the behaviour of these same mass yields in the fission-spectrum and thermal neutron fission of 235U.
Published Version
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