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Note concerning the β particles of very small Energy emitted during Radioactive Transformation

Published online by Cambridge University Press:  24 October 2008

N. Feather
N. Feather
Affiliation:
Coutts-Trotter Student, Trinity College
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Extract

A preliminary investigation is described in which a type of gold leaf source suitable for use with an expansion chamber is developed. Such a source is necessary for the detailed examination of β particles of energy less than about 50,000 electron volts by the Wilson method. Some results obtained with sources of radium D and thorium B + C of this type are presented in outline.

The writer would like here to acknowledge the help and encouragement he derived from many discussions with Professor Sir Ernest Rutherford and with Dr J. Chadwick during the course of the investigation, and further to express his thanks to Mr G. R. Crowe for assistance in the preparation of some of the sources.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 25 , Issue 4 , October 1929 , pp. 522 - 529
Copyright
Copyright © Cambridge Philosophical Society 1929

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References

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† Loc. cit.

* Figs. 4 and 5 (Plate II) provide examples of each series.

* Measurement was made by projection on to a screen at about threefold magnification (about sixfold from the photographs themselves) and the use of dividers adjusted to 1 cm. This unit of length corresponded, in the two series, roughly to 0·6 and 1·4 mm. of standard air.

* At the lowest absorptions tracks of tertiary M electrons, of energy about 8000 electron volts, might possibly begin to be registered.

† Loc. cit.

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‖ Comptes Rendus, 180, p. 1257, 1925.Google Scholar

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