Strange Pattern in USRBIN-DOSE Scoring Result

Scoring
6

Dear @Jungle,

I am taking a look to the pattern issue to fully understand it, and will come back to you asap.

In the meanwhile, you can achieve your map with good statistics and without pattern very easily:

  1. Remove all your biasing (your photons do not become rare at 1 meter distance, not at all).
  2. Remove your many air regions, just keep one big region around your source.
  3. Exploit the cylindrical symmetry of your problem to gain statistics easily → define a cylindrical USRBIN with a reasonable number of bins. You can do for instance as below. Note that you need the ROT-DEFI and ROTPRBIN cards to rotate your USRBIN, since the cylindrical symmetry of your problem is not aligned with the z axis.

image

Hope this helps,
Francisco

EDIT:
You should also reduce your transport and production thresholds for e-/e+/gammas, see the reply below.