Abstract
WE take this opportunity of replying to the criticisms expressed in Prof. Stahel's letter printed above. Prof. Stahel has investigated1 the β-particle emission of radium-D, using a point counter as was first accomplished by Riehl.2 Through a collodion window of 0.8 mm. air equivalent thickness 0.83 particles per disintegration were registered. Stahel maintains that all these particles were photoelectrons produced by the known γ-ray of 47.2 ekv. energy. He bases this contention (a) on Petrová's3 interpretation of a range distribution constructed from Wilson chamber observations, and (b) upon certain control experiments made upon the absorption in the counter window in his own researches.1
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FEATHER, N., RICHARDSON, H. Beta-Rays of Radium-D. Nature 129, 314–315 (1932). https://doi.org/10.1038/129314b0
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DOI: https://doi.org/10.1038/129314b0
