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Carbon ions offer significant advantages for deep-seated local tumors therapydue to their physical and biological properties. Secondary particles,especially neutrons caused by heavy ion reactions should be carefullyconsidered in treatment process and radiation protection. For radiationprotection purposes, the FLUKA Code was used in order to evaluate the radiationfield at deep tumor therapy room of HIRFL in this paper. The neutron energyspectra, neutron dose and energy deposition of carbon ion and neutron intissue-like media was studied for bombardment of solid water target by 430MeV/uC ions. It is found that the calculated neutron dose have a good agreement withthe experimental date, and the secondary neutron dose may not exceed one in athousand of the carbon ions dose at Bragg peak area in tissue-like media.

Study on neutron radiation field of carbon ions therapy