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:7062641

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 about 20 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: 7062641
• 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

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100 -- Nuclear Reactor Technology-- Theory & Calculation
220200* -- Nuclear Reactor Technology-- Components & Accessories
ABSORPTION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUILDUP
CALCULATION METHODS
COBALT 60
COBALT ISOTOPES
DIMENSIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY ABSORPTION
ENERGY RANGE
GAMMA RADIATION
GAMMA TRANSPORT THEORY
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
INTERPOLATION
INVARIANT IMBEDDING
IONIZATION CHAMBERS
IONIZING RADIATIONS
IRON
IRRADIATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KEV RANGE
KEV RANGE 100-1000
LAYERS
LEAD
MATERIALS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
METALS
MEV RANGE
MEV RANGE 01-10
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUMERICAL SOLUTION
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
RADIOISOTOPES
SHIELDING MATERIALS
SHIELDS
THICKNESS
TRANSITION ELEMENTS
TRANSPORT THEORY
WATER
YEARS LIVING RADIOISOTOPES