Accession Number : AD0699992

Title :   DOSE DISTRIBUTIONS IN PHANTOMS EXPOSED TO 2.95-MeV NEUTRONS,

Corporate Author : DEFENCE CHEMICAL BIOLOGICAL AND RADIATION ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Clifford,C. E.

Report Date : 10 MAY 1968

Pagination or Media Count : 9

Abstract : Fast-neutron and associated gamma dose distributions were measured in cylindrical, slab and spherical phantoms of tissue-equivalent material exposed to a broad beam of 2.95-MeV neutrons. The effect of different phantom geometries on the fast-neutron depth-dose distributions was small. In the cylinder and slab the distributions were about 15% less than that calculated by Snyder and Neufeld for an infinite slab exposed to 2.5-MeV neutrons and were in agreement with depth-dose calculations of Auxier, Snyder and Jones for a 30-cm diameter cylinder exposed to 2.5-MeV neutrons. The associated gamma-dose distributions however were highly dependent on the choice of phantom size and shape. At depths greater than 20 cm in a 36-cm diameter cylinder the gamma-contribution became the largest component of the total dose. The depth distributions of the associated gamma-dose were compared with the epithermal neutron distributions indicated by the response of a Cd-covered gamma-detector. (Author)

Descriptors :   (*FAST NEUTRONS, *RADIATION DOSAGE), (*NEUTRON CAPTURE GAMMA RAYS, RADIATION DOSAGE), EXPOSURE(PHYSIOLOGY), RADIATION HAZARDS, MEASUREMENT, HEALTH PHYSICS, DISTRIBUTION FUNCTIONS, CANADA

Subject Categories : Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE