How to convert MCNP-generated data

[Hamidul]

TL;DR Summary

Convert MCNP data to a practical spectrometer unit.

In MCNP, the flux value (f2 or f4 tally) comes with the flux per neutron. But in the practical spectrometer, the unit is different. How can I convert MCNP data that matches my spectrometer-generated data? When I go to plot both datasets, the units are different. However, my source emission rate is 70292091 n/s (252Cf). Below is the attached file of my MCNP-generated data. This data was taken at a distance of 100cm from the source. The source anisotropy according to the calibration certificate is 1.01. feel free to seek info that can be necessary.

 

[Alex A]

Hi @Hamidul,

What are the units of your spectrometer result and can you share that result?

MCNP results will be in neutrons per square cm per source neutron (I assume these tallies are for neutrons). So multiplying by the source activity is not a bad start.

You may need to know if the spectrometer result is adjusted for it's response function.

 

[Hamidul]

Hi

Hi @Hamidul,

What are the units of your spectrometer result and can you share that result?

MCNP results will be in neutrons per square cm per source neutron (I assume these tallies are for neutrons). So multiplying by the source activity is not a bad start.

You may need to know if the spectrometer result is adjusted for it's response function.

Hi Alex, The spectrometer result is below. Here I am using a Nested Neutron Spectrometer. Here it measures neutron fluence (n/(cm^2*s). The data are taken for a bare Californium-252 neutron source at a distance of 100cm from the source.
Yes, the data are unfolded with the aid of the response function.

 

[Hamidul]

Hi

Hi Alex, The spectrometer result is below. Here I am using a Nested Neutron Spectrometer. Here it measures neutron fluence (n/(cm^2*s). The data are taken for a bare Californium-252 neutron source at a distance of 100cm from the source.
Yes, the data are unfolded with the aid of the response function.

Hello @Alex

 

[Alex A]

Hi @Hamidul,

Okay, so this is just testing the SDEF really at this point. When you multiply the MCNP tally results by your emission rate and put them side by side with the spectrometer result, what does it look like?