Definitions for "Internal radiation"
A type of therapy in which radioactive substances are implanted into or close to the area needing treatment. (See also interstitial implant and intracavitary implant.)
Radiation given off by nuclear materials that have been inhaled, swallowed, or absorbed into the body through a cut, puncture, or abrasion of the skin.
Radiation therapy that uses radioactive materials placed in or near the tumor.