LANL: Radium - History, sources, properties, and uses..
Lenntech: Radium - Physical data, chemical properties, health and environmental effects..
Visual Elements: Radium - Image, general and physical information, source, uses, key isotopes, and ionisation energies..
WebElements: Radium - Extensive information on history, uses, occurrence, compounds, and properties..
Wikipedia: Radium - Properties of the element, including its history, applications, and charateristics..
Radiochemistry of Radium - Full text of the monograph by Murrell L. Salutsky (W.R. Grace and Co., Research Division, Washington Research Center, Clarksville, Maryland) and H. W. Kirby (Mound Laboratory, Miamisburg, Ohio). [PDF] (December, 1964).
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