The recoil proton dose at a bone-tissue interface irradiated by fast neutrons

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Abstract
The recoil proton dose in a body irradiated by fast neutrons is normally determined using a polythene phantom filled with a liquid simulating soft tissue. The perturbation to the dose by the presence of bone is considered for the particular case of 2 parallel slabs of bone surrounded by tissue. Typical dose curves in bone and tissue of various thicknesses are illustrated for 14 Mev neutrons, and can readily be applied to neutrons of lower energy by an appropriate scaling factor. The effect of the perturbation on the recoil proton LET [Linear energy transfer] spectra is discussed.