Accession Number : AD0665003

Title :   FAST-NEUTRON STREAMING THROUGH CONCRETE DUCTS. THEORETICAL CALCULATIONS USING THE ALBEDO CONCEPT COMPARED WITH EXPERIMENTAL RESULTS.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Song,Yo Taik

Report Date : FEB 1968

Pagination or Media Count : 348

Abstract : As a part of studies of shielding for personnel shelters, fast-neutron streaming through two-legged rectangular air ducts in concrete was investigated theoretically and experimentally. In the theoretical study of the problem, the albedo concept was employed, and numerical values of neutron dose in the second leg of ducts of various sizes were computed by IBM 1620 computer. Neutron sources employed were T(d,n)He4 reaction (14Mev), D(d,n)He3 reaction (2.5Mev), and Plutonium-Beryllium. Three sizes of concrete ducts were used as models: (1) 3 x 3 feet with a first-leg length of 15 feet; (2) 2 x 3 feet with a 12-foot first leg; and (3) 2 x 2 feet with a 12-foot first leg. In experiments, counting rates of a spherical dosimeter were measured in both the first and second legs of the ducts described for the neutron sources named. Comparisons show very good agreement between theoretical and experimental results. (Author)

Descriptors :   (*SHIELDING, DUCTS), (*DUCTS, *NEUTRON FLUX), SHELTERS, CONCRETE, FAST NEUTRONS, ALBEDO, DOSE RATE, NEUTRON SCATTERING, MONTE CARLO METHOD, COMPUTER PROGRAMS, NEUTRON SPECTRUM, NEUTRON REACTIONS

Subject Categories : Nuclear Radiation Shield, Protection & Safety

Distribution Statement : APPROVED FOR PUBLIC RELEASE