No fluence after shield!

From: Sunil C. (sunil@mailhost.tifr.res.in)
Date: Fri Aug 05 2005 - 16:38:52 CEST

  • Next message: Khnkanos N. Sanosyan: "Re: Problem in establishment of the current/starting region"

    Hi All

    I have started using FLUKA recently and have been trying a problem of
    transmission of photons through concrete. The photons are produced by
    electrons bombarding iron target.

    My problem is that USRYIELD and USRBDX gives zero photons after a shield
    placed at 1m, even when the thickness is 1cm. Both gives good counts when
    requested before the shiled, but nothing after the shield.
    I tried USRBDX with both fluence and curent extimator but again nothing. I
    tried 450 MeV and 2.5 GeV electrons, no photons after shield. I tried 1 GeV
    proton and requested neutron estimators. Again, good results before shield,
    nothing after.

    I tried FLUKA 2003 with appropriate pemf and FLUKA 2005. Same problem
    persists.

    I have appended my input below.

    I would be greatful for all the suggestions.

    Thanks in advance to all

    Sunil
    Pelletron Accelerator
    TIFR
    sunil@tifr.res.in
    TITLE
                       Gamma trnasmission problem in concrete
    *23456789 123456789 123456789 123456789 123456789 123456789 123456789
    123456789
    GEOBEGIN
        0 10 title for the geometry
    *---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+---
    -8
    * a large box for the blackhole (external vacuum)
      RPP 1 -9999999. 9999999. -9999999. 9999999. -9999999. 9999999.
    * another large box inside, for normal vacuum (recommended)
      RPP 2 -8888888. 8888888. -8888888. 8888888. -8888888. 8888888.
    * Beam incident on the iron target
      RPP 3 -1.0 1.0 -1.0 1.0 -1.0 1.0
    * The next rpp is a shield of concrete along the forward direction 10m x 10
    m x 1cm thick, 1m away
      RPP 4 -500.0 500.0 -500.0 500.0 100.0 101.0
    * The next rpp is a shield in the y direction(lateral)
      RPP 5 -500.0 500.0 100.0 101.0 -500.0 100.0
      END
     0001 +1 -2
     0002 +2 -3 -4 -5
     0003 +3
     0004 +4
     0005 +5
      END
    GEOEND
    *23456789 123456789 123456789 123456789 123456789 123456789 123456789
    123456789
    MATERIAL 26.0 55.847 7.877 11.0 0.0 IRON
    MATERIAL 2.35 26.0 PORTLAND
    MATERIAL 11.0 23.0 0.9712 27.0 SODIUM
    MATERIAL 14.0 28.086 2.33 28.0 SILICON
    MATERIAL 19.0 39.102 0.87 29.0
    POTASSIUM
    MATERIAL 20.0 40.078 1.55 30.0 CALCIUM
    COMPOUND -0.01 3.0 -0.001 6.0 -0.529107 8.0 PORTLAND
    COMPOUND -0.16 27.0 -0.002 9.0 -0.033872 10.0 PORTLAND
    COMPOUND -0.337021 28.0 -0.013 29.0 -0.044 30.0 PORTLAND
    COMPOUND -0.014 11.0 PORTLAND
    ASSIGNMAT 1 1 0
    ASSIGNMAT 2 2 0
    ASSIGNMAT 11.0 3 0
    ASSIGNMAT 26.0 4 0
    ASSIGNMAT 26.0 5 0
    *---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+---
    -8
    BEAM -2.5000 PROTON
    BEAMPOS 0.0 0.0 -
    1.1
    *---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+---
    -8
    *23456789 123456789 123456789 123456789 123456789 123456789 123456789
    123456789
    USRYIELD 2401.0 8.0 29.000 3. 2. 1. 0degree
    USRYIELD 1.0 0.001 100. 6. -6.0 3. &
    USRYIELD 2401.0 8.0 30.000 4. 2. 1. 0d-
    after
    USRYIELD 1.0 0.001 100. 6. -6.0 3. &
    USRYIELD 2401.0 8.0 31.000 3. 2. 1.
    90degree
    USRYIELD 1.0 0.001 100. 96. 84.0 3. &
    USRYIELD 2401.0 8.0 32.000 5. 2. 1. 90d-
    after
    USRYIELD 1.0 0.001 100. 96. 84.0 3. &
    USRBDX 11.0 8.0 37.000 4.0 2.0 1.0 0d-
    after
    USRBDX 1.000 0.0 1000. &
    START .1000E+07
    STOP

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