Dear, Mohammad!
In principle, you should use low neutron transport for compound materials.
Here is the example I used for low neutron transport in FLUKA through steel.
The material is steel.
First, I declared materials which is included to steel.
MATERIAL 25.0 54.93805 7.21 27.0 0.0 0.0 MANGANES
LOW-MAT 27.0 25.0 55.0 296.0 0.0 0.0 MANGANES
*
MATERIAL 24.0 51.99610 7.18 28.0 0.0 0.0 CHROMIUM
LOW-MAT 28.0 24.0 -2.0 296.0 0.0 0.0 CHROMIUM
MATERIAL 42.0 95.94 10.22 29.0 0.0 0.0 MOLYBDEN
LOW-MAT 29.0 42.0 -2.0 296.0 0.0 0.0 MOLYBDEN
*
MATERIAL 15.0 30.9737 1.82 30.0 0.0 0.0 PHOSPHO
LOW-MAT 30.0 15.0 31.0 296.0 0.0 0.0 PHOSPHO
Second I declared steel:
MATERIAL 0.0 0.0 7.8 33.0 0.0 0.0 STEEL
COMPOUND 0.01 6.0 0.2 14.0 12.1 27.0 STEEL
COMPOUND 56.28 11.0 19.2 28.0 11.0 25.0 STEEL
COMPOUND 0.3 7.0 0.9 29.0 0.01 30.0 STEEL
=
Here is a link to fluka course about low-neutrons transport:
https://www.fluka.org/free_download/course/heidelberg2011/Lectures/LowNeut0311.pdf
Regards, Vladimir
Received on Wed Mar 21 2012 - 14:44:18 CET
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