How to check the isotropy of the source in MCNP?

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SUMMARY

This discussion focuses on verifying the isotropy of a point source in MCNP (Monte Carlo N-Particle Transport Code). The user has a point source defined at coordinates -11 0 0 with a Maxwellian energy spectrum and seeks to ensure that the neutron flux is uniformly distributed. A recommended method involves surrounding the source with a transparent sphere, segmenting it into equal areas, and performing tallies on each surface to confirm isotropic distribution.

PREREQUISITES
  • Understanding of MCNP (Monte Carlo N-Particle Transport Code)
  • Knowledge of isotropic sources and their characteristics
  • Familiarity with neutron flux and its measurement
  • Basic skills in geometric modeling and segmentation techniques
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  • Explore MCNP tallies and how to implement them effectively
  • Learn about isotropic source modeling in MCNP
  • Investigate geometric segmentation techniques for source verification
  • Study Maxwellian energy spectrum and its implications in neutron transport
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Researchers, nuclear engineers, and anyone involved in radiation transport simulations using MCNP who need to verify source isotropy for accurate modeling.

angfells
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Hello everyone!
I need to make sure that my source is isotropic. How can I check that?
I have point source pos -11 0 0 erg=d1 with Maxwellian spectrum of energy and some surfaces through which neutron flux passes.
 
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How rigorous does the check need to be?

You could make everything else transparent, put a sphere round your source, segment it like an orange and then section the orange in half. Every surface would then have equal area and you could do tallies.
 
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Alex A said:
How rigorous does the check need to be?

You could make everything else transparent, put a sphere round your source, segment it like an orange and then section the orange in half. Every surface would then have equal area and you could do tallies.
To really see that the source is isotropic, i.e. the particle flow is equally distributed throughout the source volume. Everything is already transparent. Thanks for your answer, I'll try it.
 

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