Abstract
Measurements of the range of β-particles in various metals were made in 1910 by Prof. W. H. Bragg. The present Paper relates to a repetition of these measurements, employing 3 grams of radium bromide. The method consists in determining the ionisation in a lead chamber exposed to very penetrating γ-radiation, when various linings are inserted in it. The quantitative results obtained earlier are substantially confirmed by the present investigation.
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