apparent existence of a very penetrating radiation from radium and (radium + beryllium)

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Page 1: Apparent Existence of a Very Penetrating Radiation from Radium and (Radium + Beryllium)

©1939 Nature Publishing Group

Page 2: Apparent Existence of a Very Penetrating Radiation from Radium and (Radium + Beryllium)

©1939 Nature Publishing Group

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