title: The present status and future of megavoltage radiation therapy.
mesh_terms: D003036:Cobalt Isotopes; D006801:Humans; D009369:Neoplasms / Q000532:radiotherapy*; D009688:Nuclear Reactors; D011878:Radiotherapy / Q000600:supply & distribution; D011882:Radiotherapy, High-Energy; D000078329:Workforce
chemical_list: D003036:Cobalt Isotopes