Question

in a paragraph, describe the differences between external and internal radiation therapy. (site 2)

Explanation:

External radiation therapy uses a machine outside the body to deliver radiation to the tumor. Internal radiation therapy places radioactive material inside the body, close to the tumor. External is non - invasive (except for positioning), while internal may involve implants or ingestion. External treatments are usually daily for several weeks, internal may be a single or few treatments. External radiation affects a larger area (including some healthy tissue around), internal can target more precisely the tumor site.

Answer:

External radiation therapy uses an external machine to deliver radiation, is non - invasive (except positioning), has daily treatments for weeks, and affects a larger area. Internal radiation therapy places radioactive material inside the body (implants/ingestion), may have fewer treatments, and can target more precisely.