Accession Number : AD0275600

Title :   ATTENUATION OF GAMMA RADIATION IN A TWO-LEGGED 11-INCH RECTANGULAR DUCT

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : GREEN,D.W.

Report Date : 02 MAY 1962

Pagination or Media Count : 52

Abstract : R UL ARE PRESEN ED OF EXPERIMENTS CARRIED OUT WIT AN !! X !!-INCH DUCT IN CONCRETE WITH ONE RIGHT-ANGLE BEND, USING Co-60 as a gamma-ray source. Experiments cover the eff cts of moving the source and detector off e cen erline position, of replacing the inside concrete corner lip with one of lead, and of removing various scattering ar as in the corner. Measured values of a tenua ion f c or for cor r eco l g r compared with calcul ted values, using the LeDoux-Chilton analysis. The comparisons suggest that the analy is provide an u trea nt of ingl -scatter effect in the duct. Multiple-scatter effects, however, which are not taken into account by the analysis, apparently are responsible for approximat ly half of t e radia ion reaching the detector. An mpiric l e pr ion i ob ai ed hich ad quately represents most of the experimental results of duct easurem nts available at the present time. (Author)

Descriptors :   *GAMMA RAYS, *RADIOACTIVE ISOTOPES, ATTENUATION, COBALT, CONCRETE, LEAD(METAL), SCATTERING, SHIELDING

Distribution Statement : APPROVED FOR PUBLIC RELEASE