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Author Takeuchi, K. ♦ Tanaka, S. I.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CONCRETES ♦ RADIATION EFFECTS ♦ GAMMA RADIATION ♦ BUILDUP ♦ IRON ♦ LEAD ♦ WATER ♦ ACCURACY ♦ ANNIHILATION ♦ ATOMIC NUMBER ♦ BREMSSTRAHLUNG ♦ COMPTON EFFECT ♦ COMPUTER CODES ♦ DEPTH ♦ ISOTROPY ♦ MEV RANGE ♦ P CODES ♦ PHOTONS ♦ BASIC INTERACTIONS ♦ BUILDING MATERIALS ♦ DIMENSIONS ♦ ELASTIC SCATTERING ♦ ELECTROMAGNETIC INTERACTIONS ♦ ELECTROMAGNETIC RADIATION ♦ ELEMENTARY PARTICLES ♦ ELEMENTS ♦ ENERGY RANGE ♦ HYDROGEN COMPOUNDS ♦ INTERACTIONS ♦ IONIZING RADIATIONS ♦ MASSLESS PARTICLES ♦ MATERIALS ♦ METALS ♦ OXYGEN COMPOUNDS ♦ RADIATIONS ♦ SCATTERING ♦ TRANSITION ELEMENTS 360106* -- Metals & Alloys-- Radiation Effects ♦ MaterialsRadiation Effects
Abstract Gamma-ray exposure buildup factors are calculated using a discrete ordinates direct integration code, PALLAS-PL, SP-Br, for water, concrete, iron, and lead, typifying materials of low, medium, and high atomic number. The radiation sources considered were both plane, at normal incidence, and at plane-isotropic. These data include the effects of secondary photon sources arising from Compton scattering, bremsstrahlung, and annihilation. Inclusion of a bremsstrahlung source influences the exposure buildup factors for highenergy photons in materials of high atomic number. The calculational accuracy is verified by comparing the PALLAS calculations with the results of experiments with both the energy spectrum and the attenuation dose transmitted through lead where the source is a plane isotropically incident 6.2-MeV gamma ray or a plane normally incident about8-MeV gamma ray. Comparisons are also made with other calculations of exposure buildup factors in water for a 0.5- and a 3.0-MeV plane normally incident source. The calculated buildup factors in each material are tabulated for incident energies of 0.1 to 15 MeV (except for lead where the lower energy is 0.4 MeV) and for penetration depths as great as 40 mfp.
Educational Use Research
Learning Resource Type Article
Publisher Date 1984-08-01
Publisher Place United States
Journal Nucl. Sci. Eng.
Volume Number 87
Issue Number 4
Organization Ship Research Inst., Ibaraki-ken


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