Radionuclide Basics: Strontium-90 | US EPA
Radionuclide Basics: Strontium-90. Strontium (chemical symbol Sr) is a silvery metal that rapidly turns yellowish in air. Naturally occurring strontium is not radioactive. The most common man-made radioactive form of strontium is strontium-90 (Sr-90). Strontium-90 is produced commercially through nuclear. fission. for use in …