MCNP6 Disc Source Setup: Troubleshoot 0 Counts

AI Thread Summary
The user is building a sodium iodide detector using MCNP and is experiencing issues with obtaining counts, indicating that the source may not be properly hitting the detector. They are using a disc source defined in a cell beneath the detector but are consistently getting zero counts. Despite modifying the SDEF card, the problem persists, leading to uncertainty about the next steps. Another user has requested the input file to help diagnose the issue. The discussion highlights the challenges of configuring MCNP for accurate detection results.
janeeburch
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I am attempting to build a sodium iodide detector on MCNP.
I am using a disc source and I have been trying to define it in terms of a cell that I placed underneath the detector. When I run it, I get 0's for my counts. This indicates to me that my source isn't hitting my detector. I keep modifying my SDEF card but it doesn't help. I am not sure what else to do. Please tell me what could me wrong.
 
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Hi,
can you put your input file ?
 

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