COMPARISON OF DOSE PATTERNS IN A DOG EXPOSED TO NEUTRONS AND TO X RAYS

摘要

Dose distributions with depth in a dog cadaver and in a cylindrical phantom have been obtained for 1 Mvp transmitted X rays and for mixed neutron and gamma radiation from a reactor. The ratio of neutron to gamma dose was 4:1 at the surface of the dog. Measurement of the gamma or X-ray dose was made using LiF thermo luminescence dosimeters, while neutron dose was obtained from the activation of small sulfur pellets, with suitable calibrations. Placement of dosimeters was verified by roentgenography.nPenetration of the 1 Mvp X rays is considerably higher than that of the reactor neutrons, whose effective energy is about 1 Mev, and does not appear to differ significantly in various cross sections of the body as was found for 250 Kvp X rays by others.nFor the reactor beam administered unilaterally the energy deposition in the dog is strongly asymmetric as shown by is dose configurations for the neutron and gamma components. However, only minor variations were found in the depth dose curves for the phantom and different sections through the dog cadaver, namely, head, chest and abdomen, in spite of the differences in composition and density.