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radium B



Chem.
an isotope of lead, formed by decay of radium A, that gives rise to radium C, which is an isotope of bismuth, from which radium D, radium E, and radium F, or polonium 210, are derived.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

radium Aradium emanation

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