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Some of these are found in nature; the rest are produced artificially as the direct products of nuclear reactions or indirectly as the radioactive descendants of these products.

Each “parent” radioactive isotope eventually decays into one or at most a few stable isotope “daughters” specific to that parent. Some radioactive isotopes are present as terrestrial radiation.

More than 1,000 radioactive isotopes of the various elements are known.

Approximately 50 of these are found in nature; the rest are produced artificially as the direct products of nuclear reactions or indirectly as the radioactive descendants of these products.cobalt-60 is extensively employed as a radiation source to arrest the development of cancer.

In nuclear medicine, tracer radioisotopes may be taken orally or be injected or inhaled into the body.

Organic materials typically contain small amounts of radioactive carbon and potassium.

Medical applications use artificial radioisotopes that have been produced from stable isotopes bombarded with neutrons.

tritium), however, is a radioactive isotope, the other two being stable.

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.

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Its distribution can be tracked according to the radiation it gives off.