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MCNP lattice source

  1. May 1, 2017 #1
    Hi, I have a sphere that it contains many sub-spheres. I want to define these small spheres as volumetric source. But when I run MCNP, it doesn't work. MCNP error: the sampeling effeiciency is too low
    Maybe someone can help me.

    100 0 10
    200 1 -1 -10 fill=2
    300 1 -1 -2 3 -4 5 -6 7 u=2 lat=1
    fill=-8:8 -8:8 -8:8 3 4912r
    400 1 -1 30 u=3
    500 1 -1 -30 40 u=3
    600 1 -1 -40 50 u=3
    700 1 -1 -50 u=3

    c *************** Surfaces**********************
    10 so 5
    2 px 0.31
    3 px -0.31
    4 py 0.31
    5 py -0.31
    6 pz 0.31
    7 pz -0.31
    30 so 0.3
    40 so 0.29
    50 so 0.2

    c Water (rho=1)
    M1 1001 0.333
    8016 0.667
    imp:e 0 1 1 1 1 1 1
    mode e
    sdef pos=0 0 0 rad=d1 cell=d2
    si1 0 0.3
    sp1 -21 2
    si2 L (700<300<200)
    sp2 1
    nps 1000

    Thank you
    with best regards
     
  2. jcsd
  3. May 6, 2017 #2
    Thanks for the thread! 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? The more details the better.
     
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