MCNP Fatal Error: Troubleshooting Guide

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What does this error mean? How to solve it?
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Hi,
difficult to answer with no input file ...
 
Hi,
like above please give input file and also computer specs. Have you ran files before successfully?
 

Thread 'Energy Spectrum Attenuation'

Hello, I'm currently trying to compare theoretical results with an MCNP simulation. I'm using two discrete sets of data, intensity (probability) and linear attenuation coefficient, both functions of energy, to produce an attenuated energy spectrum after x-rays have passed through a thin layer of lead. I've been running through the calculations and I'm getting a higher average attenuated energy (~74 keV) than initial average energy (~33 keV). My guess is I'm doing something wrong somewhere...
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