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• Medicine imaging and tumor treatments
Thyroid imaging using Tc-99
Uses of Nuclear Radiation
Food Irradiation• Food can be irradiated with gamma rays from 60Co or 137Cs.
• Irradiated milk has a shelf life of 3 months without refrigeration.
• USDA has approved irradiation of meats and eggs.
1000-10,000 kilorads
Isotope Half-Life Radiation Emitted
Carbon-14 5,730 years
Radon-222 3.8 days
Uranium-235 7.0 x 108 years
Uranium-238 4.46 x 109 years
• Radiocarbon Dating--The radioactivity of a sample can be used to determine how old it is.• Half-life: The time for half of the nuclei to decay.
Half-Life Graph
The times given in this table are the “half-life” values for the decay of U-238 into Pb-206.
Transuranium Elements: Beyond #92
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