MCNP PTRAC card help

AI Thread Summary
The discussion focuses on using the PTRAC card in MCNP to simulate particle interactions with a specific cell and to analyze surface tally contributions. The user is experiencing issues with the PTRAC output, which appears nonsensical, and seeks clarification on the meaning of the output message regarding the number of events and histories. They inquire if the "9111 histories" indicates the number of simulated particles that meet the PTRAC criteria. The user has provided their input deck for further assistance. Clarification on these points is requested to improve the simulation results.
MadGander
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TL;DR Summary
Need help setting up and interpreting my PTRAC output.
Hi all,

I'm attempting to simulate a very specific setup in MCNP. I want to know the fraction of particles contributing to a surface tally that previously interacted (scattered) with a specified cell. I'm currently doing this via the PTRAC card as well as FILTER. Currently, my PTRAC is outputting gibberish. I'm also curious what the number is at the bottom of my regular output... "binary file ptrac written with 10000 events from 9111 histories." Does this mean 9111 simulated particles fit the requirements of the PTRAC card? I've attached my input deck below. Any help is appreciated.
 

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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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