Accession Number:

AD0699992

Title:

DOSE DISTRIBUTIONS IN PHANTOMS EXPOSED TO 2.95-MeV NEUTRONS,

Descriptive Note:

Corporate Author:

DEFENCE CHEMICAL BIOLOGICAL AND RADIATION ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s):

Report Date:

1968-05-10

Pagination or Media Count:

9.0

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

Subject Categories:

  • Radiobiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE