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The 200-MeV electron linac of the National Synchrotron Radiation Laboratory(NSRL) located in Hefei is one of the earliest high-energy electron linearaccelerators in China. The electrons are accelerated to 200 MeV by fiveacceleration tubes and are collimated by scrapers. The scraper aperture issmaller than the acceleration tube one, so some electrons hit the materialswhen passing through them. These lost electrons cause induced radioactivitymainly due to bremsstrahlung and photonuclear reaction. This paper describes astudy of induced radioactivity for the NSRL Linac using FLUKA simulations andgamma-spectroscopy. The measurements showed that electrons were lost mainly atthe scraper. So the induced radioactivity of the NSRL Linac is mainly producedhere. The radionuclide types were simulated using the FLUKA Monte Carlo codeand the results were compared against measurements made with a High PurityGermanium (HPGe) gamma spectrometer. The NSRL linac had been retired because ofupgrading last year. The removed components were used to study inducedradioactivity. The radionuclides confirmed by the measurement are: $^{57}$Ni,$^{52}$Mn, $^{51}$Cr, $^{58}$Co, $^{56}$Co, $^{57}$Co, $^{54}$Mn, $^{60}$Co and$^{22}$Na, the first eight nuclides of which are predicted by FLUKA simulation.The research will provide the theoretical basis for the similar acceleratordecommissioning plan, and is significant for accelerator structure design,material selection and radiation protection design.

Induced radioactivity analysis for the NSRL Linac in China using Monte Carlo simulations and gamma-spectroscopy