Medicine imaging and tumor treatments Thyroid imaging using Tc-99 Uses of Nuclear Radiation.

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Presentation transcript:

Medicine imaging and tumor treatments Thyroid imaging using Tc-99 Uses of Nuclear Radiation

Food Irradiation Food can be irradiated with gamma rays from 60 Co or 137 Cs. Irradiated milk has a shelf life of 3 months without refrigeration. USDA has approved irradiation of meats and eggs.

,000 kilorads

Isotope Half-Life Radiation Emitted Carbon-14 5,730 years  Radon days  Uranium x 108 years  Uranium 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