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Microdosimetry in tissue equivalent fluid irradiated by D-T neutrons.

Abstract 
LET-distributions have been measured with 0.5 in. diameter Rossi-type proportional counter at 11 points in and around a 200-1. cube of tissue-equivalent fluid irradiated by 14.7 MeV neutrons. At the maximum depth investigated (35 cm) the dose average proton LET is 15% higher than in free space, but the overall average is 19% lower due to the transfer of 7% of the total dose (excluding gammas) from multiply-charged ions to protons. The net effect is a marginal enhancement of dose in the LET range of maximum RBE. At intermediate depths, the LET distributions lie between the two extremes and vary monotonically with depth. Measurements have also been made to determine the effects of backscattered neutrons, phantom size, and phantom edges on these distributions.