radiation therapy

Radiation therapy is the use of ionizing radiation, in the form of rays from an outside source or from radium or other radioactive metal implants, in treatment of malignant disease – cancer, lymphoma, and leukemia. The principle is that rapidly dividing tumor cells are more sensitive to the destructive effects of radiation on DNA are are therefore damaged by doses that are relatively harmless to normal tissues. Certain types of malignancy indeed respond to radiation therapy but radiation sickness may also occur.