In English | En español
Questions About Cancer? 1-800-4-CANCER

NCI Dictionary of Cancer Terms

Page Options

  • Print This Page


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.

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