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NCI Dictionary of Cancer Terms

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NCI Dictionary of Cancer Terms



radioactive seed  listen  (RAY-dee-oh-AK-tiv...)

  A small, radioactive pellet that is placed in or near a tumor. Cancer cells are killed by the energy given off as the radioactive material breaks down and becomes more stable.

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Radioactive seeds; drawing shows a gloved hand using an instrument to pick up small, radioactive seeds.