Effects of Incoherent and Coherent Scattering on the Exposure Buildup Factors of Low-Energy Gamma Rays
- 1 June 1988
- journal article
- research article
- Published by Taylor & Francis in Nuclear Science and Engineering
- Vol. 99 (2) , 145-156
- https://doi.org/10.13182/nse88-a23555
Abstract
The effects of including incoherent and coherent scattering in a calculation of the exposure buildup factors for plane normal gamma-ray sources have been investigated by using an electron-gamma-ray shower Monte Carlo code, EGS4, for water, iron, and lead in the 40- to 200-keV range. The “true” buildup factors and “pseudo” buildup factors for practical uses are defined to clarify the effects of bound-electron Compton (incoherent) and coherent scattering and are tabulated for penetration depths up to 10 mfp.The pseudo buildup factor increases by including incoherent scattering and decreases by including coherent scattering. The degree of each effect varies with the atomic number of the material. The effect of incoherent scattering is large for materials of small atomic number, and the effect of coherent scattering is large for materials of large atomic number.Keywords
This publication has 7 references indexed in Scilit:
- Exposure Buildup Factors of High-Energy Gamma Rays for Water, Concrete, Iron, and LeadNuclear Technology, 1987
- Detailed Investigation of the Buildup Factors and Spectra for Point Isotropic Gamma-Ray Sources in the Vicinity of theKEdge in LeadNuclear Science and Engineering, 1986
- Buildup Factors of Gamma Rays Including Bremsstrahlung and Annihilation Radiation for Water, Concrete, Iron, and LeadNuclear Science and Engineering, 1984
- Coherent scatter in diagnostic radiologyMedical Physics, 1983
- Effect of Fluorescence, Bremsstrahlung, and Annihilation Radiation on the Spectra and Energy Deposition of Gamma Rays in Bulk MediaNuclear Science and Engineering, 1982
- Photon cross sections from 1 keV to 100 MeV for elements Z=1 to Z=100Atomic Data and Nuclear Data Tables, 1970
- Photon cross sections, attenuation coefficients, and energy absorption coefficients from 10 keV to 100 GeVPublished by National Institute of Standards and Technology (NIST) ,1969