ATTENUATION OF NITROGEN-CAPTURE GAMMA RAYS IN CONCRETE,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1966
- Accession Number
- AD0643754
Entities
People
- W. Reed Johnson
Organizations
- University of Virginia