[Gate-users] trues rising with aluminium thickness in a sensitivity test

[Vincenzo Eduardo Padulano]

Hello gate users,
I am simulating a NEMA sensitivity test. I get a very strange behaviour:
the trues count rate increases as I add more aluminium sleeves around my
source of radiation. I cannot understand the origin of the problem,
hopefully you can.
I will attach two macros, in the first one I simulate only one aluminium
sleeve around the source (2.5 mm thick), in the second one I simulate two
sleeves (5 mm thick total).
Kind Regards,
Vincenzo
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