An approximation of gamma-ray buildup factors for two-layer shields

Journal Article · Thu Sep 01 04:00:00 EDT 1983 · Nucl. Sci. Eng.; (United States)

OSTI ID:5003818

Harima, Y

An empirical formula for gamma-ray buildup factors in two-layer shields is proposed. The values of the parameters are given for the formula when fitted to the dose buildup factors, calculated by the invariant imbedding method, for normally incident gamma rays penetrating two-layer shields comprised of combinations of water, iron, or lead slabs. The results from the present formula are in excellent agreement with the basic data in the 0.66- to 10-MeV energy range and for total thicknesses up to about20 mfp. The parameters used in the formula change smoothly with the source energy. Therefore, the buildup factor for any arbitrary energy can easily be estimated by interpolation of the parameters with respect to energy. The buildup factors provided by this formula also are in good agreement with those from transport calculations for two-layer shields consisting of water and lead. These factors also agree with those measured by two ionization chambers for /sup 60/Co radiation penetrating two-layer shields comprised of water, iron, or lead slabs.

• Research Organization: Tokyo Institute of Technology Research Laboratory for Nuclear Reactors Oh-okayama, Meguro-ku, Tokyo
• OSTI ID: 5003818
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 85:1; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

654002* -- Radiation & Shielding Physics-- Shielding Calculations & Experiments-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUILDUP
CALCULATION METHODS
COBALT 60
COBALT ISOTOPES
DOSES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
GAMMA RADIATION
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
IRON
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LAYERS
LEAD
MATHEMATICAL MODELS
METALS
MINUTES LIVING RADIOISOTOPES
NEUTRAL-PARTICLE TRANSPORT
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PHOTON TRANSPORT
PLATES
RADIATION DOSES
RADIATION TRANSPORT
RADIATIONS
RADIOISOTOPES
REACTOR COMPONENTS
SHIELDS
TRANSITION ELEMENTS
WATER
YEARS LIVING RADIOISOTOPES