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Monte Carlo simulation of x-ray spectra generated by kilo-electron-volt electrons

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Monte Carlo simulation of x-ray spectra generated by kilo-electron-volt electrons

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Título Monte Carlo simulation of x-ray spectra generated by kilo-electron-volt electrons
Autor Llovet Ximenes, Xavier
Sorbier, L.
Campos, Cristiani Silveira
Acosta, E.
Salvat, F.
Abstract We present a general algorithm for the simulation of x-ray spectra emitted from targets of arbitrary composition bombarded with kilovolt electron beams. Electron and photon transport is simulated by means of the general-purpose Monte Carlo code PENELOPE, using the standard, detailed simulation scheme. Bremsstrahlung emission is described by using a recently proposed algorithm, in which the energy of emitted photons is sampled from numerical cross-section tables, while the angular distribution of the photons is represented by an analytical expression with parameters determined by fitting benchmark shape functions obtained from partial-wave calculations. Ionization of K and L shells by electron impact is accounted for by means of ionization cross sections calculated from the distorted-wave Born approximation. The relaxation of the excited atoms following the ionization of an inner shell, which proceeds through emission of characteristic x rays and Auger electrons, is simulated until all vacancies have migrated to M and outer shells. For comparison, measurements of x-ray emission spectra generated by 20 keV electrons impinging normally on multiple bulk targets of pure elements, which span the periodic system, have been performed using an electron microprobe. Simulation results are shown to be in close agreement with these measurements.
Contido em Journal of applied physics. Vol. 93, no. 7 (Apr. 2003), p. 3844-3851
Assunto Bremsstrahlung
Espectro de emissão de raios x
Ionizacao
Métodos de Monte Carlo
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/95833
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