[fluka-discuss]: ¦Ã ray count problem using USRBDX

From: YANG Tao <yangt_at_ihep.ac.cn>
Date: Fri, 6 May 2016 09:21:24 +0800 (GMT+08:00)

Hello, everyone!


I simulate the lead shielding effect for ¦Ã ray recently, but I got a strange result. Beam position is at (0,0,0) and the beam direction is in z-direction. The gamma rays were directed towards a simple cuboid lead block with 10.5 cm in thickness and 200cm*200cm in length and width. USRBDX score card has been used to obtain the transmission values, I/I0, where I0 and I are the incident and attenuated photon intensities. Theoretically, I0 is 1 photon/primary since the incident photon will all penetrate the front surface of the lead block, however, the result (31BIN, "rushe") always give ZERO result, it's confusing, where did the photons go? Additionly, the exit photon (32BIN, "chushe") also give a wrong results compared to other literature.
These problems have confused me for several days, so any help will be appreciated much!!!

Thank You!

Tao Yang

CAS



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Received on Fri May 06 2016 - 06:01:08 CEST

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