Graphite Simulation - Near Side
  
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  Click for larger image In order to reach the level of MCNP for the disk source, we started by running the code with a simple point source centered between the two disks (top left).
We proceeded to wrap the point source in a cell of graphite analogous to our baked graphite disks (top right).
The final step was to actually make the graphite the source.
   

 

The plot is of all the steps taken to achieve "real-life" geometry.

1a = tally across the entire disk with a single point source varying the separation.
2a = tally across the entire disk with a point source wrapped in graphite.
3a = tally across the entire disk with graphite as the source.
1b = tally across the far surface with point source.
2b = tally across the far surface with point source wrapped in graphite.
3b = tally across the far surface with graphite as the source.

The same procedure was done for the development of the MCNP code tallying across the near surfaces (point source, point source in graphite, graphite as source).
MCNP Far Side