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Question Unable to get proton results 

Forum: Analysis
Date: 14 Feb, 2014
From: <smharding>

I'm using the GRAS package in geant4 to recover a dose for a specific environment using a specific geometry. Upon running the simulation for electrons, the program returns reasonable results.

The issue is with the proton doses. The shielding in our geometry is sufficient enough to deter most low energy protons from getting through to any of the detectors inside. However, the weight of the environment that must be run makes generating higher level protons a rare event at best, and rarer still that it happens to enter into one of the detectors. Thus, our detectors often return a value of either zero, or something small with an error term that is greater than or equal to the rad dose itself! This may be fixed by adding an enormous number of events to it, but for reason of time, practicality, and that the system is hard capped at ~2billion events, this cannot be done. I need better statistics on the proton model, however. A bunch of 0's and a few results with error terms larger than they are will not cut it. Essentially, I need a few of those higher energy protons to actually occur, but I cannot change the weight of them as that is a static environment. Is there a method that might allow geant4 to account for this?

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