Neutron transmission

["Ryder, R (Roy)" <R.Ryder@dl.ac.uk>]

I have lots of references for the transmission of fast neutrons through

large labyrinths but does any one have a reference for a simple expression

for the transmission of fast neutrons through a duct ie.  holes about 0.25

sq m not pointed directly at the source of the radiation. Tesch in Rad Prot

Dos vol 20 No3 pp169-174 gives one for gamma transmission but I can not find

one for fast neutron.

Roy 

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