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MCNP: How to specify a small source in a large lattice

  1. Dec 6, 2014 #1
    I am working on an input file in MCNPX/6 that uses a CT scan lattice geometry. I want to specify a small source in a large universe (lung). Right now I have a source uniformly distributed through the universe. The existing documentation is vague on this topic. Is it possible to contain the source in just a few of the voxels? Thanks for any suggestions or help!

    Source definition:
    SDEF PAR=D1 ERG=D2 CEL=D3 X=D4 Y=D5 Z=D6 $ Particle dist Energy dist
    SI1 L 34 3 3 34
    SP1 .42 .25 .16 .17
    SI2 L 6.00 .7117 2.1318 7.69
    SP2 .42 .25 .16 .17 $ Particle energy short-lived
    SI3 L (4<6<8) $ 4 is the lung universe, 6 is the lattice unit cell, and 8 contains the lattice
    SP3 1
    SI4 H -25.048828 -24.658203
    SP4 D 0 1
    SI5 H -50.048828 -49.658203
    SP5 D 0 1
    SI6 H 21.625 21.875
    SP6 D 0 1
  2. jcsd
  3. Dec 11, 2014 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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