Actinium gives out easily absorbed and penetrating deviable rays like those of radium, and also a radio-active emanation, which is more allied to the emanation of thorium than to that of radium.
Source: wiktionary
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Actinium gives out easily absorbed and penetrating deviable rays like those of radium, and also a radio-active emanation, which is more allied to the emanation of thorium than to that of radium.
Source: wiktionary