An approximation of gamma-ray buildup factors by modified geometrical progression

Journal Article · Tue Feb 01 04:00:00 EST 1983 · Nucl. Sci. Eng.; (United States)

OSTI ID:5307305

Harima, Y

The empirical formula of gamma-ray buildup factors by a geometric-progression (G-P) method was modified by presenting the K parameter as a function of the penetrating distance from the source. The values of the parameters are given for the modified G-P method fitted to the exposure and absorbed dose buildup factor data for air, water, concrete, and iron calculated by a moments method code. The results from the present method are in good agreement with the basic data, for the 0.015- to 15-MeV energy range and for the 0.5- to 40-mfp distance range. The five parameters used in the formula for the modified G-P method change smoothly with the source energy. Therefore, the buildup factor for any arbitrary energy can easily be estimated by the interpolation of the parameters with respect to the energy. Moreover, this formula fits the buildup factor for lead, including bremsstrahlung, calculated by the discrete ordinates code PALLAS.

• Research Organization: Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Oh-okayama, Meguro-ku, Tokyo
• OSTI ID: 5307305
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 83:2; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

654001* -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AIR
BREMSSTRAHLUNG
BUILDING MATERIALS
BUILDUP
CALCULATION METHODS
COMPUTER CODES
CONCRETES
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
GAMMA RADIATION
GASES
GEOMETRY
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
IRON
MATERIALS
MATHEMATICS
METALS
MOMENTS METHOD
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
RADIATIONS
TRANSITION ELEMENTS
WATER