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Radiation Protection Dosimetry Advance Access originally published online on December 6, 2006
Radiation Protection Dosimetry 2006 122(1-4):46-52; doi:10.1093/rpd/ncl409
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Electron beam transport in heterogeneous slab media from MeV down to eV

M. Yousfi1,*, J. Leger1, J. F. Loiseau2, B. Held2, O. Eichwald1, B. Defoort3 and J. M. Dupillier3

1 Université Paul Sabatier, Centre de Physique des Plasmas et leurs applications-UMR du CNRS n°5002, 118 Route de Narbonne, 31062 Toulouse Cedex 9, France
2 Université de Pau et des Pays de l'Adour, Laboratoire d'Electronique, des Gaz et Plasmas, BP 1155, 64013 Pau Cedex, France
3 EADS ST, Avenue du General Niox, 33165 Saint Medard en Jalles Cedex, France

* Corresponding author: yousfi{at}cpat.ups-tlse.fr


  Abstract

An optimized Monte Carlo method based on the null collision technique and on the treatment of individual interactions is used for the simulation of the electron transport in multilayer materials from high energies (MeV or several hundred of keV) down to low cutoff energies (between 1 and 10 eV). In order to better understand the electron transport and the energy deposition at the interface in the composite application framework, two layer materials are considered (carbon and polystyrene with densities of 1.7 g cm–3 and 1.06 g cm–3, respectively) under two slab or three slab configurations as, e.g. a thin layer of carbon sandwiched between two polystyrene layers. The electron-matter cross-sections (electron-carbon and electron-polystyrene) used in the case of pure material (carbon and polystyrene) as well as our Monte-Carlo code have been first validated. The boundary interface layer is considered without any mean free path truncation and with a rigorous treatment of the backscattered and also the forward scattered electrons from one layer to another. The large effect of the choice of a low cutoff energy and the dissociation process consideration are also clearly shown in the heterogeneous multi-layer media more particularly on the secondary electron emission, inelastic collision number and energy spectra.


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