Medicine imaging and tumor treatments

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Uses of Nuclear Radiation

• Medicine imaging and tumor treatments

Thyroid imaging using Tc-99
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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.

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1000-10,000 kilorads
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• 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.

Isotope Half-Life Radiation
Emitted Carbon-14 5,730 years b,
g Radon-222 3.8 days a Uranium-235 7.0 x
108 years a, g Uranium-238 4.46 x 109 years
a
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Half-Life Graph
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The times given in this table are the half-life
values for the decay of U-238 into Pb-206.
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Transuranium Elements Beyond 92