|Message: Re: electron range in TestEm18||Not Logged In (login)|
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On Tue, 05 May 2009 17:16:35 GMT, Yannick Arnoud wrote:
> Attachment: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.55-22633-dumpTexte.gif > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.55-46331-dumpEcran.gif > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.59-35030-electron.gif > > Dear Geant 4 experts, > > We are testing the energy loss of electrons in water. We used the > TestEm18 example and obtained a very weird result for "low" energy > electrons. All the 1 keV electrons we generate experience one > interaction after 63.1 microns, and lose all their energy. The stepcut > we use is 1 nm, far smaller than this 63 microns length. > > Is our set of parameters wrong ? (see attached electron.mac) Do you have > any piece of advice ? >
Most likely you have already realized that the range is 63 nanometers (not microns), which is of the order of what we expect from de/dx, ~120 MeV/cm according NIST.
Please, see also TestEm0.