Analysis of Activated Materials of Disposed Medical Linear Accelerators according to Clearance Level for Self-Disposal

In Korea, when replacing or discarding parts of a medical linear accelerator (linac), self-disposal is required in the consideration activity, but there no standard regulation to manage radioactive waste. The aim this study check activity each part determine disposal time according clearance level for self-disposal. results measuring components linac head disposed Varian, Elekta, and Siemens equipment were reflected Monte Carlo simulation confirm radionuclide change presence absence impurities. To degree activation linac, main radionuclides after shutdown, considering workloads 40/80 Gy/day 10/15 MV irradiated with beams 10 years parts, concentration was confirmed. As result applying notice Korean Nuclear Safety (KINS) part, most could be dismantled 1 month, 15 target primary collimators stored long period before being dismantled. Although additional identified impurities, timing did not significantly. study, applied activated by three manufacturers predict at which workers are exposed radiation during dismantling/disposal.