Dear FLUKA experts:
A simple model was established in which 1kW, 9.77 MeV electrons bombarded a 1 mm thick Ta, and the usrbin was used to calculate the dose around the target.
The absorbed dose of air at 1 m behind the target is about 83,000 cGy/min, and the ionization chamber data I have learned is about 8,500 cGy/min.
This data is almost 10 times different, I checked the unit conversion ((1.602E-7)*6.389E14*60*100), and there was probably no error.Below is my input file and data
plane.flair (11.2 KB)
plane.inp (6.3 KB)
Note that your beam goes through a 0.5 mm Ta thickness (and not 1 mm), starting in the middle of the target, and this makes already a considerable difference.
Then, make sure to properly model the actual experimental conditions.