Title
Comparison of the probability density functions for the ranges of electrons, positrons and protons
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
conferenceObject
Publication
London ,
Subject
Chemistry
Source (journal)
Journal of analytical atomic spectrometry. - London
Volume/pages
14(1999) :3 , p. 509-512
ISSN
0267-9477
ISI
000079138500029
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The probability density functions Phi(rho z) for electrons, positrons and protons as well as for the ionizations [phi(rho z)] caused in the samples by the primary beams of the above mentioned particles have been studied. All of the dependencies obey Weibullean statistics. It has been shown that the probability density functions for the distribution of electrons as well as for positrons can be expanded from the conventional energy region of tens of keV to the region even closer to 1 MeV. The only difference is the disappearance of the surface charging in the high-energy region. A similar Phi(rho z) curve has been shown for the first time also for protons. The family of the ionization curves phi(rho z) seems to tend to be enveloped by the respective probability density curve Phi(rho z) for the distribution of the charged particle beam of the given energy. This has been shown for different tracers in a copper matrix. Given the probability density functions, one can easily select the correct solutions for the simulations of the particle beam attenuation in ambiguous situations; e.g., for 10 keV positrons penetrating a copper matrix it has been shown that the only proper energy-loss functions used in the simulations were those taking 11 and not 2 valence electrons into account.
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