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The distribution of range of the α particles from radium C′ and thorium C′

Published online by Cambridge University Press:  24 October 2008

N. Feather  and
R. R. Nimmo
N. Feather
Affiliation:
Coutts-Trotter Student, Trinity College
R. R. Nimmo
Affiliation:
Clare College, 1851 Exhibition Scholar, University of New Zealand.
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Extract

From measurement of tracks formed in an expansion chamber range distribution curves are obtained relative to 2134 α particles from thorium C′ and 729 α particles from radium C′. These curves exhibit marked differences in the proportion of short range particles which each contains. The origin of these differences is discussed. Estimates are made of the linear straggling coefficients relative to the absorption of the two groups of particles in air (in the experimental arrangement other media entered as well). These results very definitely confirm the conclusions reached by Briggs from measurements of the straggling of velocity of the particles. The sources of error which enter when the expansion chamber is used for the measurement of straggling coefficients are briefly reviewed.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 25 , Issue 2 , April 1929 , pp. 198 - 204
Copyright
Copyright © Cambridge Philosophical Society 1929

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