I want to see the peak for an explosive detector simulation in MCNP

[kg09889]

TL;DR

I put some background radiation to make it more realistic, but I can't see the peak.

I'm trying to find explosives using a 14MeV neutron generator. The main energies I'll see are 4.43MeV of carbon, 5.11MeV of nitrogen, and 6.13MeV of oxygen. These are all prompt gamma rays that come from reacting with fast neutrons. I've tried shielding with 2cm thick lead to see the peak of this energy, but I can't see it very well... What should I do? I share the code and geometry I made.
Please help me...

 

[sbrothy]

I'm nowhere qualified to actually answer or guide you, but reading on I found this interesting for someone like me who wants a basic introduction:

Neutron-based Methods for the Detection of Explosives.



Hope the source is acceptable:

“Security Theory and Practice”, Department of Science and Research, Police Academy of the Czech Republic in Prague.