Programs that treat people who have a particular illness or condition through the application of chemical reagents which have a specific and toxic effect upon the disease-causing organism, or through the use of radioactive substances including radioactive isotopes and ionizing radiation to kill diseased cells. Included are radioactive implants, x-ray radiation therapy and supervoltage and megavoltage treatments with specialized equipment including cobalt units, linear accelerators with or without electron team therapy capability, betatrons and van de Graff machines.