Strontium-90 (^90Sr) is a radioactive isotope of strontium, which is a chemical element with the symbol Sr and atomic number 38. It is produced primarily as a byproduct of nuclear fission in reactors and during atomic bomb explosions. Strontium-90 has a half-life of approximately 28.8 years, which means it takes this amount of time for half of a given amount of the isotope to decay.
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