The LET Distribution of the Recoil Proton Dose from DD and DT Neutrons

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Abstract
The proton recoil absorbed dose from fast neutrons, measured at depth in a tissue-equivalent phantom using a Bragg-Gray type detector, is expressed as a function of the linear energy transfer, LET. The experimental distribution of dose with LET is compared with the theoretical distributions predicted by Boag for 2.5 Mev and 14.1 Mev neutrons, and by Snyder for 2.5 Mev neutrons. A comparison is made between the technique described in this report, by which the LET distribution of dose can be determined at any point in the phantom, and the spherical proportional counter method of Rossi and Rosenzweig. The experimental curves show excellent agreement with those predicted by Boag. There is also good agreement with Snyder''s curves near the front face of the phantom, but significant differences in the center and towards the back of the phantom.