MCNP5 tallies conversion and MCNPX

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SUMMARY

The discussion focuses on converting MCNP5 flux (F4:N tally) from MCNP units to cm-2s-1 units and troubleshooting an error in MCNPX related to a missing "bertin" library file. To convert the flux, users must scale the tally by the volume of the detection cell, which can be achieved by using a coin-shaped detection cell with a radius of 1 cm and a thickness of 0.318 cm to ensure unit volume. The error in MCNPX indicates that the required "bertin" library file is missing, which is essential for the program to function correctly.

PREREQUISITES
  • Understanding of MCNP5 and MCNPX simulation software
  • Knowledge of F4:N tallies and their applications
  • Familiarity with volume scaling in radiation detection
  • Access to the "bertin" library file for MCNPX
NEXT STEPS
  • Research the process of converting MCNP5 tallies to different units
  • Learn about the geometry and volume calculations in MCNP5
  • Investigate common errors in MCNPX and their resolutions
  • Explore the use of library files in MCNPX and how to manage them
USEFUL FOR

Radiation physicists, nuclear engineers, and researchers using MCNP5 and MCNPX for radiation transport simulations and analysis.

nuclearsneke
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TL;DR
tl;dr how to convert flux gotten via F4:N tally to cm-2s-1 units?
Hi there

I want to convert the flux (F4:N tally) from mcnp units to cm-2s-1 units. How to do that?

Also I have some bug in MCNPX: while running the file, I get an error like "
>bad trouble in imcn in routine xin
>Cannot find bertin
"
How to solve it? Database for MCNP5-MCNPX got installed already.
 
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Howdy! In general MCNP F4:N tallies need scaling by the volume of the detection cell. They are track length tallies but the units end up the same and the flux ends up right when scaled. I've found if I use a detection 'coin shape', make the radius whatever I need, say 1cm, I can make the thickness 0.318 to give the detection cell unit volume and then the tally is automatically right. I've read that MCNP is capable of working out the volume for some shapes, but I've not seen this work.

You should have a library file called "bertin", it's one of the extra files X needs.
 

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