I am scoring the edep within the detector region, using plane source ( 30x60 cm2, totally cover the detector).
When incident photons with energy 129keV, I got a edep (none zero). However, when I changed the incident photons energy to 29keV, I got zero edep.
In theory, 29keV incident photons can transport to the detector region and deposit energy within it.
Can’t figure out why the edep suddenly drops to zero.
Any suggestions are appreciated! The following is the input file. test.inp (4.4 KB)
Also, you might want to check the direction and the size of your beam. The beam is directed along the z-axis while your system seems oriented along the y-axis. The beam size is also larger than your system.
It might be useful to add a USRBIN scoring of ALL-PART fluence.