Accession Number : AD0643754

Title :   ATTENUATION OF NITROGEN-CAPTURE GAMMA RAYS IN CONCRETE,

Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE

Personal Author(s) : Johnson,W. Reed

Report Date : NOV 1966

Pagination or Media Count : 59

Abstract : Shielding experiments were performed to measure the attenuation by concrete slabs of nitrogen-capture gamma radiation. A collimated capture gamma-ray beam was produced by placing a Be3N2 target in the reactor end of a tangential beam hole. A 2-inch diameter beam with an average intensity of approximately 43 mR/h was allowed to impinge at the center of an ordinary concrete-slab shield; this shield was approximately 4-1/2 feet on a side and ranged from 4 to 24 inches thick. The slabs of the shield were rotated to allow measurements at beam angles of incidence of 90, 60, and 45 degrees. The gamma-ray exposure was integrated in a plane behind and parallel to the shield for each shield thickness and angle of incidence. The integrated exposure was determined by summing individual measurements made in a regular pattern in the plane behind the shield. (Author)

Descriptors :   (*SHIELDING, *CONCRETE), (*GAMMA RAYS, ATTENUATION), NUCLEAR REACTIONS, NITROGEN, DOSIMETERS, COLLIMATORS, NEUTRON CAPTURE, DOSE RATE

Subject Categories : Ceramics, Refractories and Glass
      Nuclear Radiation Shield, Protection & Safety

Distribution Statement : APPROVED FOR PUBLIC RELEASE