Re: Modelling kerma with FLUKA

From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Tue Sep 06 2005 - 04:13:40 CEST

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    To score photon kerma, set the electron and positron cut-off
    to a very large value (larger than the beam energy) in the regions
    where you want to score. At each photon interaction, the electrons
    produced are stopped at the production place and their energy
    is deposited there (so what you score is the Kinetic Energy of the charged
    particles Released in MAtter, namely KERMA).


    On Mon, 5 Sep 2005, Burge, F (Frances) wrote:

    > Dear FLUKA users,

    > I am a relatively new user of FLUKA and am attempting to reproduce the
    > results obtained in a paper. The authors used EGS4 to model doses in an
    > ICRU4 detector, from a 6GeV electron beam which strikes a copper
    > absorber, behind which the detector is located. The paper is
    > 'Calculation of electron-photon doses behind beam absorbers at high
    > energy electron accelerators' by Dinter, Pang and Tesch, published in
    > Rad. Prot. Dosim. Vol 28 No.3 (1989).
    > The authors calculate both dose and a quantity referred to as 'photon
    > kerma' in the report. Whilst I have been able to obtain good results for
    > dose using FLUKA's SCORE command with generalised particle type 211
    > (e+,e- and photons), I am not sure how I would calculate the photon
    > kerma (in terms of what estimators to use, how to identify only the
    > particles from primary interactions, etc). Can anyone suggest how this
    > might be done?

    > Many thanks,

    > Frances Burge

    > Health Physicist
    > 01235 778269
    > Diamond Light Source Ltd.
    > Rutherford Appleton Laboratory
    > Chilton
    > Didcot
    > OX11 0QX

    Alberto FassÚ
    SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025
    Phone: (1 650) 926 4762   Fax: (1 650) 926 3569

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