Dear experts, 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…

Dear Honghu, using the PRECISION default, FLUKA only transport electrons and photons down to 100 keV kinetic energy. https://flukafiles.web.cern.ch/flukafiles/manual/DEFAULTS.html You can lower this limit to 1 keV for electrons and 100 eV for photons uding the EMFCUT card. https://flukafiles.web.c…

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.

Dear amario, Thanks for your suggestions, USRBIN scoring of ALL-PART is added and checked, the photons can cover the system and interact with the detector. Best regards, Honghu

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Energy deposition drops to 0

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