<unk>  is the process by which an item is exposed to radiation. The exposure can be intentional, sometimes to serve a specific purpose, or it can be accidental. In common usage the term refers specifically to ionizing radiation, and to a level of radiation that will serve that specific purpose, rather than radiation exposure to normal levels of background radiation or abnormal levels of radiation due to accidental exposure.
Irradiation
Radiation therapy
Chemotherapy
Particle radiation
Photothermal Therapy
External beam radiotherapy
Hormone therapy
Ionizing radiation