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The upper limit of energy in the β-ray spectrum of actinium B

Published online by Cambridge University Press:  24 October 2008

B. W. Sargent
B. W. Sargent
Affiliation:
Lecturer in Physics, Queen's University, Kingston, Ontario.
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Extract

Using a thin-walled electroscope, absorption curves in paper and aluminium were obtained for the β-rays of actinium (B + C) and actinium C″. From these curves the range of the β-rays of actinium B was found to be 0·08 ± ·02 gm./cm.2 The energy required for this range is 300,000 ± 50,000 volts, which must be the end-point of the continuous spectrum.

On account of the overlapping of the β-ray spectra of actinium B and actinium C″ the range method can never yield an accurate value of the end-point of the former. Magnetic analysis appears to be the best means of finding this accurately, but the weakness and rapid decay of sources are formidable difficulties.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 29 , Issue 1 , January 1933 , pp. 156 - 160
Copyright
Copyright © Cambridge Philosophical Society 1933

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References

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