Detailed behavior of exposure buildup factor in stratified shields for plane-normal and point isotropic sources, including the effects of bremsstrahlung and fluorescent radiation

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Nuclear Science and Engineering; (United States)

DOI:https://doi.org/10.13182/NSE92-52· OSTI ID:6461413

Harima, Yoshiko ^[1]; Hirayama, Hideo ^[2]

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1. Tokyo Inst. of Tech. (Japan)
2. National Lab. for High Energy Physics, Ibaraki (Japan)

Exposure buildup factors, energy spectra, and angular flux distribution for plane-normal incident and point isotropic source gamma rays of 0.1, 0.5, 1, 3, 6, and 10MeV penetrating two-layer water-lead and lead-water shields are calculated with the point Monte Carlo code EGS4. The effects of bremsstrahlung and fluorescent radiation are included. The value of the buildup factor in the second layer lies between those for infinite media of both materials in two source geometries in the 0.5- to 3-MeV energy range. However, this behavior varies remarkably and is enhanced with a bremsstrahlung contribution, when the source energy is higher than that corresponding to the minimum in the attenuation coefficient of lead. This varies equally with the fluorescent contribution when the source energy is close to the K edge of lead.

• OSTI ID: 6461413
• Journal Information: Nuclear Science and Engineering; (United States), Journal Name: Nuclear Science and Engineering; (United States) Vol. 113:4; ISSN NSENAO; ISSN 0029-5639
• Country of Publication: United States
• Language: English

Related Subjects

663620* -- Physics of Radiations Other Than Neutrons-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ANGULAR DISTRIBUTION
BIOLOGICAL SHIELDS
BREMSSTRAHLUNG
BUILDUP
CALCULATION METHODS
COMPUTER CODES
DISTRIBUTION
E CODES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
GAMMA RADIATION
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
LAYERS
LEAD
MATERIALS
METALS
MEV RANGE
MONTE CARLO METHOD
NEUTRAL-PARTICLE TRANSPORT
OXYGEN COMPOUNDS
PHOTON TRANSPORT
POINT SOURCES
RADIATION SOURCES
RADIATION TRANSPORT
RADIATIONS
SHIELDING
SHIELDING MATERIALS
SHIELDS
SORPTION
SPECTRA
WATER