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Free-nucleon target model applied to penetration and dose calculations for 200 and 400 McV protons and neutrons.

A new, a.implified model for the transport of high energy neutrons and protons through matter is described. Nuclear interactions are treated by assuming nucleons in the target material to be free, initially at rest, and uniformly distributed in space. Calculations of the transport of 200 MeV and 400 MeV protons and neutrons through a 30 cm thick soft tissue slab are performed, and the results compared with an earlier, more detailed model. The absorbed dose within the slab as well as the number, angular distribution, and energy distribution of particles penetrating the slab are compared for the two models. The freenucleon model gives results for certain dose and shielding calculations which are in agreement with those obtained by the detailed model. The free-nucleon model can, in principle, be extended to the highest energies for which experimental nucleon-nucleon and pion-nucleon cross sectional data exist.