What is the key difference between external radiation treatment and internal radiation treatment?

The key difference between external radiation treatment and internal radiation treatment is that internal radiation involves the use of a radioactive substance placed inside the body, while external radiation employs high-energy beams, such as X-rays or gamma rays, directed at the tumor from outside the body. This distinction is crucial because internal radiation, also known as brachytherapy, directly targets the cancer cells with a localized dose of radiation, allowing for higher doses at the tumor site while minimizing exposure to surrounding healthy tissue.

On the other hand, external radiation is applied from a distance and thus does not require placing any radioactive materials in the body, making it a different approach altogether. The method chosen is based on the type and location of the cancer, as well as the overall treatment plan for the patient.