On an accelerator-based bnct facility *

Because thermal load of Lithium (7Li) is lower than Be, the 7Li is easy to change to liquid state when the 7Li was bombarded, and the mixed isotope 6Li is also easy to be transmuted 7Be with 53 days’ radioactive half-life [2]. Thus, we chose Be as our neutron target material. As an initial calculation, the beam spot on target was Φ20, and the beam was Gaussian distribution. As shown in Fig. 2 and Fig. 3, the proton stops 0.41mm and 6.78 10-4 neutron was produced when a 7 MeV proton particle bombarded on the Be target by using FLUKA code. That means 4.24 1013 neutrons will be produced when the beam current and energy are 10 mA and 7 MeV. According to our calculation, the maximum energy of neutron was about 5 MeV and over 109 n/cm2/sec neutrons will be delivered to patients, and the 7 MeV proton particle could be stopped at 0.4mm.