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Radium

Radium

Radium is a rare, radioactive alkaline earth metal extracted in small quantities from pitchblende. The isotope radium-226 is the most common and is an intermediate in the uranium series. It has a half life of 1,622 years and is formed by the emission of an alpha particle by thorium-230.


References
Stedman, Thomas Lathrop. Stedman's Medical Dictionary. 24th edition. Baltimore: Williams and Wilkins, 1982.

Thomas, C.L. 1985. Taber's Cyclopedic Medical Dictionary. F.A. Davis Co. Pub., Philadelphia. 2170.