DIRAC is the world's most comprehensive database on radiotherapy resources. It comprises current and historical global data on radiotherapy centres, teletherapy machines, brachytherapy units, treatment planning systems, computed tomography systems and simulators. DIRAC contains information on radiotherapy infrastructure in 141 countries ​

The IAEA has collected data on radiotherapy facilities since 1959. The online DIRAC database is continuously updated with information provided voluntarily by organizations, radiotherapy centres and other institutions around the world. Data shared to be included in DIRAC undergoes a process of review and verification to detect whether there are any inconsistencies and to ensure it is complete