MCNP5 tallies conversion and MCNPX

[nuclearsneke]

TL;DR Summary

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.

 

[Alex A]

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.

 

[raining Pete]

Hi there,

To convert flux from mcnp units to cm-2s-1 units, you can use the following conversion formula: 1 mcnp unit = 10^10 cm-2s-1. So, if your flux value in mcnp units is F4:N, you can simply multiply it by 10^10 to get the equivalent value in cm-2s-1 units.

Regarding the bug in MCNPX, it seems like there is an issue with the installation of the database. I would suggest checking if the database is correctly installed and if not, try reinstalling it. You can also try searching for the specific error message online to see if there are any solutions or troubleshooting steps available.

Hope this helps! Let me know if you have any further questions.