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- W1999462717 abstract "The scheme used by EGS4/PRESTA to perform electron multiple scattering steps is examined. It is shown that a problem occurs when electrons step onto boundaries. The problem is related to the general issue of multiple scattering displacement being uncorrelated with scattering angle. It is not caused by inaccuracies in the Molière distribution. A distortion arises in the fluence at the boundary, and propagates into the adjacent region with consequences that depend on the particular geometry. For an idealised cylindrical cavity, diameter 2 cm, width 2 mm, exposed face-on to a beam of 1 MeV electrons, the average fluence excess in the cavity is 0.7% when EGS4/PRESTA is run with the refined settings Estep = 1% and Ecut = 10 keV. The issue should be addressed directly, by improving the multiple scattering step scheme, rather than by simply reducing step length." @default.
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- W1999462717 date "1995-05-01" @default.
- W1999462717 modified "2023-10-01" @default.
- W1999462717 title "The modelling of electron multiple scattering in EGS4/PRESTA and its effect on ionisation chamber response" @default.
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- W1999462717 doi "https://doi.org/10.1016/0168-583x(95)00320-7" @default.
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