THE EFFECT OF SOURCE DISTANCE ON BUILDUP FACTOR FOR GAMMA RAYS PENETRATING INTO A COMPARTMENTED STRUCTURE,
Abstract
In order to correlate some basic measurements of radiation attenuation made on an aircraft carrier to other situations and geometries, experiments were carried out to study the effects of source distance on the dose distribution inside a model-sized compartmented structure intended to simulate the carrier. Data are presented in the form of buildup factors (B sub r) as a function of source-to-detector distance for two configurations of the compartmented structure. Buildup factors are also presented as a function of the slant path through the interposing steel plates for the case where the source is considered far from the structure. Comparisons of the buildup factors within our complex structure with the more basic single-slab dose-buildup factors obtained by other investigators are also presented. In every case, the buildup factor for the compartmented structure was found to be consistently and significantly lower than the single-slab data. The greatest differences in buildup ammounted to 30%. Among the several effects that contribute to the buildup, the slant path of the primary radiation and the effects due to the geometry of the detector and slab appear most important. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 08, 1963
- Accession Number
- AD0424880
Entities
People
- A. L. Frank
- M. B. Hastings
- S. Tomoeda
Organizations
- Naval Radiological Defense Laboratory