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The number of α-particles emitted by thorium C + C′

Published online by Cambridge University Press:  24 October 2008

S. W. Watson  and
M. C. Henderson
S. W. Watson
Affiliation:
Gonville and Caius College (1851 Exhibition Scholar, University of South Africa)
M. C. Henderson
Affiliation:
Trinity College
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Extract

The number of α-particles emitted per second by thorium (C + C′) has been determined by an ionisation method. The number obtained is 4·26 ± ·08 × 1010 α-particles per second per curie equivalent γ-ray activity when in equilibrium with radio-thorium and when measured by the γ-rays of thorium C″ through 18 mm of lead. The result agrees within 1 per cent, with that extrapolated from Shenstone and Schlundt's values.

The same apparatus was used to determine the slope of the Bragg curve over the first three centimetres of the range. The data fit the curve as given by I. Curie and Behounek within the accuracy of experiment. The curve given by G. H. Henderson falls too rapidly as it approaches the axis of ordinates.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 24 , Issue 1 , January 1928 , pp. 133 - 138
Copyright
Copyright © Cambridge Philosophical Society 1928

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