Accession Number : AD0736176


Title :   Comparison of Dose Patterns in a Miniature Pig Exposed to Neutron and to Gamma Radiation.


Descriptive Note : Technical note,


Corporate Author : ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD


Personal Author(s) : Verrelli,D. M. ; Shosa,D. W.


Report Date : OCT 1971


Pagination or Media Count : 19


Abstract : Depth-dose patterns were compared for significantly different mixtures of incident radiations from the AFRRI-TRIGA nuclear reactor. Neutron to gamma ray tissue kerma ratios of 10:1 and 0.06:1 were used for exposure of a miniature pig cadaver. Measurement of the dose distribution patterns across the brain and across the intestinal regions was performed employing the paired ionization chamber technique. Placement of the dosimeters within the cadaver was verified by radiography and by dissection of the specimen. For the high neutron field, the ratio of neutron to gamma ray doses for a unilateral irradiation ranged from 3.2 at the entrance to the brain to 1.9 at the brain exit. The ratio incident on the head was measured to be 8.5. Across the intestinal region, the neutron to gamma ray dose ratio for a bilateral irradiation ranged from 1.5 to 0.8. For the high gamma ray field, the incident neutron to gamma ray ratio was 0.06. For this field, the dose pattern is substantially that produced by a photon field containing no neutrons. (Author)


Descriptors :   (*WHOLE BODY IRRADIATION, *DOSIMETERS), RADIATION DOSAGE, GAMMA RAYS, NEUTRONS, NUCLEAR REACTORS, TISSUES(BIOLOGY)


Subject Categories : RADIOBIOLOGY


Distribution Statement : APPROVED FOR PUBLIC RELEASE