Understanding MCNP Tally F5 Output: Tips for Beginners

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SUMMARY

This discussion focuses on interpreting the output of MCNP Tally F5, specifically regarding collided and uncollided photon flux. Beginners are guided to consider both types of flux for accurate calculations in simulations, as real-world experiments cannot differentiate between them. Users are encouraged to share their input files for better assistance and to understand the rationale behind choosing Tally F5 over other tally types.

PREREQUISITES
  • Understanding of MCNP (Monte Carlo N-Particle Transport Code)
  • Familiarity with Tally F5 output and its components
  • Basic knowledge of photon flux concepts
  • Ability to manipulate and share MCNP input files
NEXT STEPS
  • Research how to interpret MCNP Tally F5 output files
  • Learn the differences between collided and uncollided photon flux in MCNP
  • Explore best practices for creating and sharing MCNP input files
  • Study the implications of choosing different tally types in MCNP simulations
USEFUL FOR

Beginners in nuclear engineering, researchers using MCNP for simulations, and anyone interested in understanding photon flux calculations in Monte Carlo methods.

Sonong
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I am beginner in MCNP. Could someone please show me how to read the output file when using Tally F5. I saw that the result involves collided and uncollided photon flux, so which part needs to be chosen for calculating? Thank you.
 
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If you are using an input file written by an expert that you can share you should rename it to add .txt and attach it to the thread. If you wrote it yourself and chose an F5 over another tally I would ask why?

For a real world problem you would calculate using collided and uncollided flux unless you know you want something different. Real world experiments can't tell one from the other, that is only possible in a simulation.
 
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