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The yield of 139Ba in the fission of natural uranium by fast and slow neutrons

Published online by Cambridge University Press:  24 October 2008

E. Broda ,
L. Kowarski  and
D. West
E. Broda
Affiliation:
Cavendish LaboratoryCambridge
L. Kowarski
Affiliation:
Cavendish LaboratoryCambridge
D. West
Affiliation:
Cavendish LaboratoryCambridge
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Abstract

The yields of 139Ba per fission in natural uranium by unslowed neutrons from a mixed radium-beryllium source and by C-group neutrons were compared. In each case the fission rates measured with an ionization chamber were correlated with the β-ray activity of 139Ba, chemically extracted from a mass of uranium oxide exposed to an identical neutron spectrum. The ratio of the two fission yields is found to be 0·84 ± 0·03. The possibility of using 139Ba as a local or integrating indicator of fission in extended uraniferous media, and of distinguishing between the contributions by fast neutrons and by slow neutrons is discussed.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 44 , Issue 1 , January 1948 , pp. 124 - 132
Copyright
Copyright © Cambridge Philosophical Society 1948

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References

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