An iterative method for calculating gamma-ray build-up factors in multi-layer shields
- 20 December 2005
- journal article
- research article
- Published by Oxford University Press (OUP) in Radiation Protection Dosimetry
- Vol. 116 (1-4), 489-492
- https://doi.org/10.1093/rpd/nci192
Abstract
Point kernel codes that simulate gamma-ray transport often use build-up factors to take scattered photons into account. This study introduces a new method, for computing multi-layer shield build-up factors. This method, based on an empirical formula for calculating double-layer shield build-up factors, is iterative. For an N-layer shield, each iteration of the method treats the first and the second layer of the shield. It replaces these layers by a single equivalent layer composed of an appropriate material and, hence, it turns the N-layer shield into an (N − 1)-layer shield. In order to determine the equivalent layer of an appropriate material, a neural network approach is developed: some neural networks trained on a large set of various configurations provide the equivalent material for any double-layer configuration. The method is implemented into MERCURE-6.3 straight-line attenuation code and is validated by comparison between MERCURE-6.3 results and reference data for one-dimensional geometries. Reference data obtained from transport calculations performed using the Sn transport code TWODANT. The comparisons prove the accuracy and sturdiness of the method.Keywords
This publication has 6 references indexed in Scilit:
- Formulas Giving Buildup Factor for Double-Layered ShieldsNuclear Technology, 2000
- A Comparison of Gamma-Ray Buildup Factors for Water, Iron and Lead using Discrete Ordinates, Moments, and Monte Carlo MethodsJournal of Nuclear Science and Technology, 2000
- A New Approximating Formula for Calculating Gamma-Ray Buildup Factors in Multilayer ShieldsNuclear Science and Engineering, 1999
- Improvement of Gamma-Ray SnTransport Calculations Including Coherent and Incoherent Scatterings and Secondary Sources of Bremsstrahlung and Fluorescence: Determination of Gamma-Ray Buildup FactorsNuclear Science and Engineering, 1996
- Some Considerations of Buildup Factors in γ Ray Penetration for Multiple LayersJournal of the Atomic Energy Society of Japan / Atomic Energy Society of Japan, 1965
- Transmission of gamma radiation through heterogeneous mediaAtomic Energy, 1962