Improvement of Gamma-Ray S<sub>n</sub>Transport Calculations Including Coherent and Incoherent Scatterings and Secondary Sources of Bremsstrahlung and Fluorescence: Determination of Gamma-Ray Buildup Factors

Kitsos, S.; Diop, Cheikh M’Backé; Assad, Ali; Nimal, J.C.; Ridoux, P.

doi:10.13182/nse96-a24184

Cited by 22 publications

(7 citation statements)

References 24 publications

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“…The TRIPOLI-4 TTB implementation proceeds along the lines indicated by Kitsos, Diop, Assad, et al [16] and Riz [17]. The most notable difference with respect to the MCNP6 implementation concerns the fact that TRIPOLI-4 accounts for the angular straggling of the condensed electrons; therefore, the bremsstrahlung photons are not necessarily emitted around the initial electron direction.…”

Section: E Thick-target Bremsstrahlung Modementioning

confidence: 99%

Advances in the Treatment of the Electromagnetic Cascade in the TRIPOLI-4 Monte Carlo Code

Mancusi

Bonin

Hugot

et al. 2018

IEEE Trans. Nucl. Sci.

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TRIPOLI-4 R is a Monte-Carlo particle-transport code developed at CEA-Saclay (France) that is employed in the domains of nuclear-reactor physics, criticality-safety, shielding/radiation protection and nuclear instrumentation. The goal of this paper is to report on current developments, validation and verification made in TRIPOLI-4 in the treatment of electron/positron/photon transport. The new capabilities and improvements concern refinements to the electron transport algorithm, the introduction of a charge-deposition score, the new thick-target bremsstrahlung option, the upgrade of the bremsstrahlung model and the improvement of electron angular straggling at low energy. The importance of each of the developments above is illustrated by comparisons with calculations performed with other codes and with experimental data.

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Section: E Thick-target Bremsstrahlung Modementioning

confidence: 99%

Advances in the Treatment of the Electromagnetic Cascade in the TRIPOLI-4 Monte Carlo Code

Mancusi

Bonin

Hugot

et al. 2018

IEEE Trans. Nucl. Sci.

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“…They have been calculated by running a discrete ordinates transport code, TWODANT [8], and following a method described by KITSOS, et al [9]. Energy groups, angular mesh and space mesh have met the following features: 218 energy groups from 1 keV to 10 MeV, P7 for the Legendre expansion of the scattering cross sections, S96 for the Gauss-Legendre angular quadrature and at least 28 spatial meshes per mean free path.…”

Section: Single-layer Shield Build-up Factorsmentioning

confidence: 99%

NARMER-1: a photon point-kernel code with build-up factors

et al. 2017

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Abstract. This paper presents an overview of NARMER-1, the new generation of photon point-kernel code developed by the Reactor Studies and Applied Mathematics Unit (SERMA) at CEA Saclay Center. After a short introduction giving some history points and the current context of development of the code, the paper exposes the principles implemented in the calculation, the physical quantities computed and surveys the generic features: programming language, computer platforms, geometry package, sources description, etc. Moreover, specific and recent features are also detailed: exclusion sphere, tetrahedral meshes, parallel operations. Then some points about verification and validation are presented. Finally we present some tools that can help the user for operations like visualization and pre-treatment.

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“…The application of two modules, RECONR and GAMINR, in the NJOY [15] cross-section processing code constructed the pointwise, energy dependent cross sections from the ENDF photoatomic files into a multigroup photon structure that could be used for primary photon interactions. Scattering cross section calculations were determined with the Legrende order P 7 approximation and a 1/E weight function based on Kitsos' analysis of Legrende expansions [17]. The Legrende order is a polynomial equation that is fitted to the stated ENDF probability P(u) of a photon's interaction as a function of the cosine of the angle at which it interacts, whereas the Monte Carlo code tabulates the probability from the specific ENDF curve.…”

Section: Group Structure and Cross Sectionsmentioning

confidence: 99%

Improvement of Photon Buildup Factors for Radiological Assessment

Schirmers

2006

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Slant-path buildup factors for photons between 1 keV and 10 MeV for nine radiation shielding materials (air, aluminum, concrete, iron, lead, leaded glass, polyethylene, stainless steel, and water) are calculated with the most recent cross-section data available using Monte Carlo and discrete ordinates methods. Discrete ordinates calculations use a 244-group energy structure that is based on previous research at Los Alamos National Laboratory (LANL), but extended with the results of this thesis, and its focused studies on low-energy photon transport and the effects of group widths in multigroup calculations. Buildup factor calculations in discrete ordinates benefit from coupled photon/electron cross sections to account for secondary photon effects. Also, ambient dose equivalent (herein referred to as dose) buildup factors were analyzed at lower energies where corresponding response functions do not exist in literature. The results of these studies are directly applicable to radiation safety at LANL, where the dose modeling tool Pandemonium is used to estimate worker dose in plutonium handling facilities. Buildup factors determined in this thesis will be used to enhance the code's modeling capabilities, but should be of interest to the radiation shielding community.

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Improvement of Gamma-Ray S_nTransport Calculations Including Coherent and Incoherent Scatterings and Secondary Sources of Bremsstrahlung and Fluorescence: Determination of Gamma-Ray Buildup Factors

Cited by 22 publications

References 24 publications

Advances in the Treatment of the Electromagnetic Cascade in the TRIPOLI-4 Monte Carlo Code

Advances in the Treatment of the Electromagnetic Cascade in the TRIPOLI-4 Monte Carlo Code

NARMER-1: a photon point-kernel code with build-up factors

Improvement of Photon Buildup Factors for Radiological Assessment

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Improvement of Gamma-Ray SnTransport Calculations Including Coherent and Incoherent Scatterings and Secondary Sources of Bremsstrahlung and Fluorescence: Determination of Gamma-Ray Buildup Factors

Cited by 22 publications

References 24 publications

Advances in the Treatment of the Electromagnetic Cascade in the TRIPOLI-4 Monte Carlo Code

Advances in the Treatment of the Electromagnetic Cascade in the TRIPOLI-4 Monte Carlo Code

NARMER-1: a photon point-kernel code with build-up factors

Improvement of Photon Buildup Factors for Radiological Assessment

Contact Info

Product

Resources

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Improvement of Gamma-Ray S_nTransport Calculations Including Coherent and Incoherent Scatterings and Secondary Sources of Bremsstrahlung and Fluorescence: Determination of Gamma-Ray Buildup Factors