Calculation of x-ray spectra emerging from an x-ray tube. Part I. electron penetration characteristics in x-ray targets.
Poludniowski, GG and Evans, PM (2007) Calculation of x-ray spectra emerging from an x-ray tube. Part I. electron penetration characteristics in x-ray targets. Medical Physics, 34 (6). pp. 2164-2174.
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The penetration characteristics of electron beams into x-ray targets are investigated for incident electron kinetic energies in the range 50-150 keV. The frequency densities of electrons penetrating to a depth x in a target, with a fraction of initial kinetic energy, u, are calculated using Monte Carlo methods for beam energies of 50, 80, 100, 120 and 150 keV in a tungsten target. The frequency densities for 100 keV electrons in Al, Mo and Re targets are also calculated. A mixture of simple modeling with equations and interpolation from data is used to generalize the calculations in tungsten. Where possible, parameters derived from the Monte Carlo data are compared to experimental measurements. Previous electron transport approximations in the semiempirical models of other authors are discussed and related to this work. In particular, the crudity of the use of the Thomson-Whiddington law to describe electron penetration and energy loss is highlighted. The results presented here may be used towards calculating the target self-attenuation correction for bremsstrahlung photons emitted within a tungsten target.
|Divisions :||Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Vision Speech and Signal Processing|
|Date :||June 2007|
|Identification Number :||10.1118/1.2734725|
|Uncontrolled Keywords :||Computer-Aided Design, Electrons, Equipment Design, Equipment Failure Analysis, Models, Theoretical, Radiation Dosage, Radiography, Radiometry, Scattering, Radiation, Spectrometry, X-Ray Emission, X-Rays|
|Depositing User :||Symplectic Elements|
|Date Deposited :||14 Dec 2012 11:18|
|Last Modified :||23 Sep 2013 19:53|
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