A comparison of gamma-ray buildup factors for low-Z material and for low energies using discrete ordinates and point Monte Carlo methods

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · Nuclear Science and Engineering; (USA)

OSTI ID:5580284

Harima, Y ^[1]; Hirayama, H ^[2]; Ishikawa, T ^[3]; Sakamoto, Y; Tanaka, S ^[4]

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1. Tokyo Inst. of Tech. (Japan). Research Lab. of Nuclear Reactor
2. National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan)
3. Fujita Corp., Tokyo (Japan)
4. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment

This paper discusses the calculation of exposure and absorbed dose buildup factors for a photon point source in infinite beryllium in the low-energy range of 0.03 to 0.3 MeV, for penetration depth up to 40 mfp, using two discrete ordinates codes, PALLAS-PL, SP-Br, and ANISN. Comparisons of both result to values obtained by point Monte Carlo calculations using the electron gamma shower version 4 code show reasonable agreement for two types of sources: normally incident and point isotropic sources. The fitting parameters of a geometric-progression method formula are determined for the resulting buildup factor data. These fitting parameters are in good agreement with the basic data within 5% over a great variation in magnitude.

• OSTI ID: 5580284
• Journal Information: Nuclear Science and Engineering; (USA), Journal Name: Nuclear Science and Engineering; (USA) Vol. 96:3; ISSN 0029-5639; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100 -- Nuclear Reactor Technology-- Theory & Calculation
220400* -- Nuclear Reactor Technology-- Control Systems
654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
A CODES
CALCULATION METHODS
COMPUTER CALCULATIONS
COMPUTER CODES
DISCRETE ORDINATE METHOD
DOSES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
GAMMA RADIATION
IONIZING RADIATIONS
MASSLESS PARTICLES
MONTE CARLO METHOD
P CODES
PARAMETRIC ANALYSIS
PHOTONS
POINT SOURCES
RADIATION DOSES
RADIATION SOURCES
RADIATIONS
S CODES