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Thanks a lot for your reply. Why penelope gives more accurate results? Is it because penelope and standard physics use different multiple scattering theory? Or is there any difference in the cross-section library? Quoting Vladimir IVANTCHENKO <email@example.com>: > > Hello, > > In 9.4p02 bremsstrahlung spectrun provided by Penepole or Livermore > is more accurate. With newest version of Genat4 - 9.5p01 Standard > Opt3, Livermore and Penelope are nearly the same. > > VI > > On Sat, 7 Jul 2012, Eleni wrote: > >> >> *** Discussion title: Medical Applications >> >> Hello all, >> >> I am simulating a medical linac. After running a number of simulations I >> end up with better results (while comparing G4 results with my >> experiment results concerning the bremsstrahlung spectra) by using Low >> energy Physics (penelope). while in the README file of the medical linac >> example the recommended EM library is the Standard_option3. How could be >> explained? I am using G4 version 4_9_4 patch02 >> >> Thanks in advance >> >> ------------------------------------------------------------- >> Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply >> or unsubscribe) at: >> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/medical_app/307.html >> > >