Apparent Existence of a Very Penetrating Radiation from Radium and (Radium + Beryllium)

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A FEW years ago, one of us1 observed a very penetrating radiation emitted by a strong source of radium, having an absorption coefficient in lead of about μ = 0.03 cm.-1. We have recently reinvestigated this phenomenon, as there were grounds for supposing that the radiation might consist of mesotrons. The arguments in favour of this view may be summarized as follows:

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NAHMIAS, M., HOPWOOD, F., BANKS, T. et al. Apparent Existence of a Very Penetrating Radiation from Radium and (Radium + Beryllium). Nature 143, 1065–1066 (1939) doi:10.1038/1431065b0

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