Excerpt from Radium and Radioactivity
The properties peculiar to radium are traceable to the actions of the radiations. Such properties are' action on photographic plates, power of producing beautiful scintillations and coloured phosphorescence with zinc blende and certain other minerals, power to bring about many chemical actions, continual and relatively considerable evolution of heat, and various beneficial therapeutic actions which have resulted from its application in medicine.
We, must, therefore, study these radiations with exactness, and must consider their mode of produc tion. The substances producing them are known.
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