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The numerical calculation of the scattering correction in γ ray absorption measurements

Published online by Cambridge University Press:  24 October 2008

G. T. P. Tarrant
G. T. P. Tarrant
Affiliation:
Pembroke College
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Extract

The method of applying the scattering correction in accurate γ ray absorption measurements is discussed, and it is shown that the scattering correction only diminishes, as the solid angle subtended by the chamber at the source is reduced, if the absorber diameter is reduced correspondingly. The method of calculation of the scattering correction in cases in which the absorber is placed very close to the chamber is explained, and the result of the calculation for one particular chamber is shown to be in satisfactory agreement with the experimental values. The scattering correction allows the ionization function of chambers to be determined and an (ionization function)/(wave-length) curve is shown for a steel thick-walled high-pressure ionization chamber.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 28 , Issue 4 , October 1932 , pp. 475 - 489
Copyright
Copyright © Cambridge Philosophical Society 1932

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References

* Zeits. für Phys. 52 (1928), 853.Google Scholar

* Gray, and Tarrant, , Proc. Roy. Soc. A, 136 (1932), 661.CrossRefGoogle Scholar

† Gray and Tarrant, ibid.

* In deducing this mean value we use the empirical photoelectric law of L. H. Gray.

* Gray and Tarrant, loc. cit.

* Gray and Tarrant, loc. cit.