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For understanding the biological effects of neutrons, predictions of thesecondary charged particle distributions by neutron irradiation are needed inbiophysical models. We have performed detailed Monte-Carlo simulations usingthe PHITS computer code of the the dose and fluence spectra of chargedparticles in the biological materials irradiated by neutron beams with energiesbelow 10 MeV. We compare the results for two different neutron spectra used inradiobiology experiments; the spontaneous fission neutron spectrum of$^{252}$Cf, and a 4 MeV d-Be generated neutron spectrum. The results show thatover 90% of the dose and fluence are from secondary protons, which are lowenergy (<2 MeV) and high LET, and indicate higher secondary charged particlefluence near the surface compared to the deep tissue regions in a mouse. It isalso suggested that the different neutron sources considered result in largelysimilar types of secondary particles with modestly varying fluencedistributions.

Dose and Fluence Distributions of the Primary and Secondary Particles in  Biological Material Irradiated by $^{252}$Cf Fission Neutrons and d-Be  Generated Neutrons