Radiation Shielding Design of a Cancer Therapy Facility using Compact Proton Synchrotron

Radiation shielding design of a cancer therapy facility using compact proton synchrotron was carried out. Foi bulk shielding calculation, the effective dose attenuation formula based on Moyer Model was used. Attenuatioi lengths used in the formula were derived by the one-dimensional discrete ordinate code ANISN using the DLC 119/HIL086 high-energy multi-group cross section library. For skyshine dose calculation, SHINE-III code was used To calculate radiation streaming through mazes and ducts, Nakamura and Uwamino’s formula and DUCT-III code were applied, respectively. As an emission of neutron by proton beam losses, measured neutron yield spectra o1 256MeV incident proton at LANL was used. To determine an emission of gamma ray by the beam losses, the FLUKA routine bundled in GEANT code was used. Results from the calculation satisfy the limits from the domestic law of the radiation protection.