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

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The discussion focuses on using a 14MeV neutron generator to detect explosives by analyzing prompt gamma rays emitted from carbon, nitrogen, and oxygen. The user is struggling to identify energy peaks at 4.43MeV, 5.11MeV, and 6.13MeV due to inadequate visibility, even after applying 2cm thick lead shielding. Suggestions for improving detection methods and understanding neutron-based techniques for explosive detection are sought. A reference to a source on security theory and practice is provided for further reading. The conversation highlights the challenges and complexities of simulating explosive detection in MCNP.
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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...

스크린샷 2025-04-04 003825.png
 

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