Dear Geant4 users,
I am simulating the dose deposited in a water phantom by a (already validated) 6MV medical linear accelerator. Up to now, I was using the command-based scoring, but since I want to personalize my scoring in the future, I recently changed to Multi Functional Detector.
The problem is that the results (for dose deposited in a water phantom) obtained with the command based scoring and the Multi Funcional Detector are quite different (provided everything else - including the seeds - is exactly the same for both simulations). With the command-based scoring, the simulated curve follows the measured curve (which is our reference), while the Multi Functional Detector simulated curve does not match the measured data (I have data with better statistics, but for some reason, I was not able to upload here, and it is even clearer that one curve matches the measurements and the other doesn’t ).
I have checked the geometry several times, I can not find the source of these discrepancies, and neither can I determine which result should I trust (the one from command-based or the one from Multi Functional Detector).
Does anyone have a clue and/or have experienced this problem before?
Thank you very much in advance!