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Shielding Analysis for a 40-MeV Electron Linac Facility

Kai Masuda, Toshiteru Kii, Hideaki Ohgaki, Heishun Zen, Tetsuo Yamazaki

Nuclear Technology

Volume 168 / Number 2 / November 2009 / Pages 467-471


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A shielding layout for a 40-MeV electron linac is presented. The linac building consists of 15-cm concrete roof and walls, and 2-m-thick shielding walls for horizontal shielding. No shielding roof covers the linac, which reduces the capital cost of the facility building. Though the present shielding layout allows an operation of up to 11.8-W averaged beam power, experimental dose equivalent rates are found to be much greater than that predicted by the skyshine formula. Monte Carlo (MCNP 4C) simulations indicate considerable contributions of radiation scattering by the thin roof and walls.

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