Re: shielding_distributions

From: Sebastien WURTH (wurth@ipno.in2p3.fr)
Date: Wed Sep 12 2007 - 13:43:51 CEST

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    Hello Ercan,

    Deposited energy is in GeV/cm3/primary
    Fluence is in part/cm²/primary

    Then you can use routines comscw.f (for converting deposited energy into
    dose) or routine fluscw.f (to convert fluence to dose).
    You can also use deq99c.f routine only for fluence to dose conversions
    (deq99c works with fluscw).

    There are hints in the manual for fluscw and comscw (in user routines
    chapter) and several posts in the fluka discuss about deq99c.f.

    If you simulate a beam or a source you must know the parameters :
    activity, energy, intensity, etc.
    You just have to multiply your fluka result which is given for one
    neutron, one electron, one whatever_you_throw... by the proper values.

    Example : a electron beam of 50 MeV / 10 µA leads to an electron flux of
    6.25 e+13 e-/s is directed towards a UC2 target.
    I calculate neutron fluence with USRBIN : it gives me neutrons per cm²
    per primaries (electron)
    I use deq99c to convert fluence to dose : the unit is Sv per primaries
    --> * e-6 --> µSv per electron
    I multiply (for example using pawlevbin program in fluka distribution
    there is a normalization factor which could be set) this result by my flux
    --> I obtain µSv per second --> *3600 --> µSv per hour.

    Hope it helps.

    Sebastien

    Ercan Pilicer wrote :

    >hello,
    >
    >for the deposited energy;
    >USRBIN 10.0 ENERGY 70.0 300.0 150.0 550.0Energy
    >USRBIN -300.0 -150.0 -250.0 120.0 30.0 80.0&
    >but in what unit?
    >
    >for neutron flux;
    >USRBIN 10.0 8.0 80.0 300.0 150.0 550.0Neutron
    >USRBIN -300.0 -150.0 -250.0 120.0 30.0 80.0&
    >the unit of what i get from fort.80 since it gives per primary?
    >
    >for gamma dose;
    >dr.Klaus Ott gave me some instruction about converting to units of
    >Sv/h. briefly;
    >- check *.out standart output file to see avarage cpu time used and
    >then convert to number of primaries;
    >*START 1.E4 99999999. 60.0 99999999.
    >* Average CPU time used to follow a primary particle: 2.720E-04 seconds of
    >* 1 hour run = 1 x 3600 / 2.720E-04 = 13235294 = 1.32e7
    >START 1.32E7 99999999. 60.0 99999999.
    >- and plot a plane by paw
    >
    >it sounded complicated to me so i am looking for another way. any comment?
    >
    >and while searching for, found a work about this.
    >www-zeuthen.desy.de/students/2006/doc/marquardt.pdf
    >
    >
    >cheers
    >e.
    >
    >
    >
    >On 9/11/07, Ercan Pilicer <ercanpilicer@gmail.com> wrote:
    >
    >
    >>dear users,
    >>
    >>i would like to simulate distributions of;
    >>- gamma dose (Gy/h)
    >>- neutron flux (n/cm2)
    >>- deposited energy (MeV)
    >>in TAC experimental hall.
    >>
    >>could you please give some comments (how-to-do) for any of this?
    >>
    >>cheers,
    >>e.
    >>
    >>ps. i attached the input file
    >>
    >>
    >>
    >>+++++++++++++++++++++++++++++++++
    >>Ercan Pilicer
    >>High Energy Physics Department
    >>Uludag University, Turkey
    >>+++++++++++++++++++++++++++++++++
    >>
    >>
    >>
    >>
    >
    >
    >
    >


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