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Many rocks and organisms contain radioactive isotopes, such as U-235 and C-14.
These radioactive isotopes are unstable, decaying over time at a predictable rate.
In nuclear medicine, tracer radioisotopes may be taken orally or be injected or inhaled into the body.
The radioisotope circulates through the body or is taken up only by certain tissues.
tritium), however, is a radioactive isotope, the other two being stable.
Radiotherapy commonly is used to treat cancer and other conditions involving abnormal tissue growth, such as hyperthyroidism.
Beams of subatomic particles, such as protons, neutrons, or alpha or beta particles, directed toward diseased tissues can disrupt the atomic or molecular structure of abnormal cells, causing them to die.
Radon, generated by the radioactive decay of radium, is present in air.
Organic materials typically contain small amounts of radioactive carbon and potassium.