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fuel for fission reactions in nuclear power plants
Uranium-235
dating the age of fossils of once living organisms
C-12 to C-14
dating the age of non-living fossils and the age of Earth
U-238 to Pb-206
diagnosing and treating thyroid disorders
Iodine-131
treatment of cancer and irradiation of food
Cobalt-60
smoke detectors
Americium-241