Re: Can anybody determine dose at the center of a sphere?

From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Mon Feb 13 2006 - 19:19:48 CET

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    Brandon,

    on most computers, your input is unreadable. Please send it as a text
    attachment.

    Concerning SCORE and USRBIN, as I have tried to explain to you several
    times off-list, their results DO ALWAYS AGREE, provided that they refer to the
    same portion of space and that you provide the volume normalization to the
    SCORE result. If there is a strong dose gradient, and the binning mesh is
    smaller than the corresponding region, of course they cannot agree.

    The same consideration holds for comparing with "what is published in
    literature". The scoring region of space must be the same, otherwise
    no comparison can be done.

    Alberto

    On Mon, 13 Feb 2006, Reddell, Brandon D wrote:

    > This is a multi-part message in MIME format.
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    > Dear FLUKA users,
    >
    > I have a very fundamental and rather simple question that nobody seems
    > to be able to answer. How do you correctly determine dose at the center
    > of a solid aluminum sphere. I want to compare FLUKA 3D results with
    > results from others codes, such as Shieldose2 and GEANT4.
    >
    > I've included a test input file as an example. The results from SCORE
    > and USRBIN 1) don't agree with each other, then 2) they aren't even
    > close to that from the other codes. Ultimately, I would like to get the
    > dose at the center of a sphere from an isotropic source/spectrum (hence
    > my source command at the bottom). For now, I am directing all energy to
    > the center -- the answer should be relatively close to that from an
    > isotropic source.
    >
    > Can any body help me determine dose in Rad or Gy at the center of a
    > solid sphere --- and provide an answer that consistent with what is
    > published in literature?
    >
    > Sincerely,
    >
    > Brandon
    >
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    -- 
    Alberto FassÚ
    SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025
    Phone: (1 650) 926 4762   Fax: (1 650) 926 3569
    fasso@slac.stanford.edu
    

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