Detailed Behavior of Exposure Buildup Factor in Stratified Shields for Plane-Normal and Point Isotropic Sources, Including the Effects of Bremsstrahlung and Fluorescent Radiation
Autor: | Yoshiko Harima, Hideo Hirayama |
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Rok vydání: | 1993 |
Předmět: |
Physics
Range (particle radiation) 010308 nuclear & particles physics Monte Carlo method Isotropy 0211 other engineering and technologies Bremsstrahlung Gamma ray 02 engineering and technology 01 natural sciences Electromagnetic radiation Computational physics Nuclear physics Nuclear Energy and Engineering K-edge Attenuation coefficient 0103 physical sciences 021108 energy |
Zdroj: | Nuclear Science and Engineering. 113:367-378 |
ISSN: | 1943-748X 0029-5639 |
Popis: | 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. |
Databáze: | OpenAIRE |
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