Abstract
THE permanent radio-active substances uranium, thorium and radium all give out two types of rays, one easily absorbed and non-deviable by a magnetic field and the other more penetrating in character and deviated by a magnetic field. In addition to these rays, Villard, using the photographic method, first drew attention to the existence of some very penetrating rays from radium non-deviable by a magnetic field. This result was confirmed by Becquerel.
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RUTHERFORD, E. Penetrating Rays from Radio-active Substances. Nature 66, 318–319 (1902). https://doi.org/10.1038/066318a0
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DOI: https://doi.org/10.1038/066318a0
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