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On Thu, 25 Oct 2012 11:03:42 GMT, Cejo George wrote:
> Dear Michel, > Sorry to bother you again. But then will you please explain me 'timeOfExposure' > parameter in Geant4.
It's not a "parameter in Geant4." It is knowledge you have about your actual experimental setup. You tell GEANT4 (through the /run/beamOn command) how many individual events you want to generate. You then analyze how those events affect your detector (hits, tracking, energy deposition, whatever you have written).
In order to convert "number of events" into something physically meaningful, you have to supply your own knowledge: The activity of your source (number of decays per second, or beam intensity, or whatever) and/or the total time you plan to run (the "time of exposure" as Michel wrote).
If you know your source intensity (in becquerels, or in protons per spill, or whatever), then you can _compute_ the effective exposure time in your simulation from beamOn divided by intensity.
If you know the exposure time that your want your simulation to represent, then you can compute what the source intensity has to be, from beamOn divided by exposure time.
-- Michael Kelsey