R: Coincidence counting between 2 NaI detectors

From: Stefano Agosteo (agosteo@ipmce7.cesnef.polimi.it)
Date: Fri Jul 06 2007 - 10:33:06 CEST

  • Next message: Vasilis Vlachoudis: "Re: source.f - how "transparent" ?"

    Dear all,
    I have been using the DETECT card since many years and it works very well.
    I used it 5 or 6 years ago for simulating a germanium detector (a planar one
    and a coaxial one in anticoincidence with a NaI Compton suppressor and the
    simulated spectra (relating to different gamma source) were in a
    satisfactory agreement with the experimental ones (apart from uncertainties
    in the detector geometry).

    Now I am using it for a telescope silicon detector coupled to a plastic
    converter for neutron (recoil proton) spectrometry and also in this case the
    simulated spectra of deposited energy are in a satisfactory agreement with
    the experimental ones.

    Biasing must not be used with this card. The post processing of the fort.17
    file is fairly simple (the manual explains how to do it).

    Regards
    Stefano

    -----Messaggio originale-----
    Da: owner-fluka-discuss@mi.infn.it [mailto:owner-fluka-discuss@mi.infn.it]
    Per conto di Sebastien WURTH
    Inviato: giovedì 5 luglio 2007 16.56
    A: Lonnie Cumberland
    Cc: fluka-discuss@fluka.org
    Oggetto: Re: Coincidence counting between 2 NaI detectors

    Hi Lonnie,

    I think it is possible by using DETECT card (please see fluka's manual
    at the corresponding section) and be aware to use FLUKA in analog mode
    only and not using any biasing (note 2 in manual). I never tried it
    that's why I said "think", maybe the post processing of the output data
    is not as simple as for other fluka's applications (fluence or dose
    scoring, resnuclei scoring,, ...) because there is not yet (as far as I
    know) in the fluka package a fortran routine which deals with results of
    logical unit 17 (the unit number in which the output from DETECT card is
    written).

    Regards.
    Sebastien.

    Lonnie Cumberland wrote :

    > Greetings All,
    >
    >
    >
    > I have been using MCNP for a little while now, but now it seems that
    > MCNP cannot handle a problem that we would like to model and in my
    > searching, seem that FLUKA can from what I have been reading.
    >
    >
    >
    > What we want to model is 2 simple NaI detectors, place a Cs-137 (or
    > some other source) source between them and get the generated spectrum
    > for each detector as well as the coincidence tally spectrum.
    >
    >
    >
    > Is there a easy way to do this with FLUKA?
    >
    >
    >
    > I am really new to FLUKA and if it can handle the coincidence counting
    > issues, as well as being easy to use, then we will probably switch
    > from using MCNP to this package but I would like to run some simple
    > case tests first and any help that you can give me would be greatly
    > appreciated.
    >
    >
    >
    > Thanks and have a great day,
    >
    > Lonnie Cumberland, Prof.
    >
    > Nuclear/Mathematical Physicist
    >
    >
    >
    > (301) 975-6869 (Office)
    >
    > (313) 333-2935 (Cell)
    >
    > (301) 926-7416 (Fax)
    >
    >
    > National Institute of Standards and Technology
    >
    > Ionizing Radiation Division (846)
    > Radiation Physics Group (245), Room C106
    >
    > ADDRESS:
    >
    > 100 Bureau Drive, Stop 8462
    > Gaithersburg, MD 20899-8462
    >
    >
    >
    > EMAIL: lonnie.cumberland@nist.gov <mailto:lonnie.cumberland@nist.gov>
    > http://physics.nist.gov/Divisions/Div846/div846.html
    >
    >
    >


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