A calculation method for the dosage of neutrons by near-threshold Li-7(p,n)(7) Be and gamma rays by Li-7(p,p'gamma)Li-7 was validated through experiments with variable distance between the Li target and the phantom focusing on large angular dependence.
By the dosage evaluation using the validated calculation method, a boron-dose enhancer (BDE) introduced in this study to increase B-10(n,alpha)Li-7 dose in a living body was effective. The void used to increase doses in deep regions was also valid with the BDE. The region satisfying the requirements of the protocol in intra-operative BNCT for brain tumors in Japan was acknowledged to be comparable to present BNCT, for the proton energy of 1.900 MeV for example. It was found that intra-operative BNCT using near-threshold Li-7(p,n)Be-7 direct neutrons is feasible.