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A Closed-Form Formulation for the Build-Up Factor and Absorbed Energy for Photons and Electrons in the Compton Energy Range in Cartesian Geometry

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Author(s): Marco Túllio Vilhena | Bárbara Rodriguez | Bardo Ernest Bodmann | Volnei Borges | Julio Cesar Fernandes

Journal: Advances in Molecular Imaging
ISSN 2161-6728

Volume: 02;
Issue: 01;
Start page: 23;
Date: 2012;
Original page

Keywords: Build-Up Factor | Compton Energy | Cartesian Geometry | Fokker-Plank Equation

ABSTRACT
In this work, we report on a closed-form formulation for the build-up factor and absorbed energy, in one and two di- mensional Cartesian geometry for photons and electrons, in the Compton energy range. For the one-dimensional case we use the LTSN method, assuming the Klein-Nishina scattering kernel for the determination of the angular radiation intensity for photons. We apply the two-dimensional LTSN nodal solution for the averaged angular radiation evaluation for the two-dimensional case, using the Klein-Nishina kernel for photons and the Compton kernel for electrons. From the angular radiation intensity we construct a closed-form solution for the build-up factor and evaluate the absorbed energy. We present numerical simulations and comparisons against results from the literature.
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Tango Jona
Tangokurs Rapperswil-Jona