Radium

               

• Radium is a radioactive element that occurs naturally in very low concentrations (about one part per trillion) in the earth’s crust.
• Radium in its pure form is a silvery-white heavy metal that oxidizes immediately upon exposure to air
• Radium was first discovered in 1898 by Marie and Pierre Curie, and it served as the basis for identifying the activity of various radionuclide.
• Radium-226 is a radioactive decay product in the uranium-238 decay series and is the precursor of radon-222.