From: Sebastien WURTH (wurth@ipno.in2p3.fr)
Date: Mon Jul 10 2006 - 13:51:59 CEST
Guo Wen a écrit :
> Dear Dr. Sebastien:
> I am very sorry still to bother you.I've understood your detail
> explanations(thank you very much)and immediately make tests following
> your method(the input file attached).I use a point proton source
> irradiating a lead sphere shell isotropically and score the
> fluence(photon) in a outer sphere shell at two decay times after
> irradiated,I use two same USRTRACK cards with two output files,the
> data at two decay times are exactly same,I do not know if there is
> another switch controling the decays except the RADDECAY cards?
> eagerly waiting for your help!
>
> My best regards!
>
> guowen
>
>------------------------------------------------------------------------
>
>TITLE
> Fluence Scoring for Isotropic Neutron Source
>DEFAULTS NEW-DEFA
>*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
>BEAM -1.000 0.0 100000.0 0.0 0.0 1.0 PROTON
>BEAMPOS 0.0 0.0 0.0 0.0 0.0 POSITIVE
>* Source start at (0.0,0.0,0.0)
>*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
>GEOBEGIN 0.0 COMBINAT
> SPHRICAL SHELL PHANTOM
>*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
> SPH 1 0.0 0.0 0.0 100.0
> SPH 2 0.0 0.0 0.0 120.0
> SPH 3 0.0 0.0 0.0 300.0
> SPH 4 0.0 0.0 0.0 400.0
> SPH 5 0.0 0.0 0.0 500.0
> END
>*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
> 1 5 1
> 2 5 -1 2
> 3 5 -2 3
> 4 5 -3 4
> 5 5 -4 5
> END
>GEOEND
>*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
>* Vacuum Region
>ASSIGNMA 2.0 1.0
>* black hole
>ASSIGNMA 1.0 5.0
>ASSIGNMA 2.0 3.0 4.0
>ASSIGNMA 17.0 2.0
>*
>*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----*
>IRRPROFI 3600000. 1.5E15
>RADDECAY 1.0 1.0 0.0 0.0 0.0
>DCYTIMES 1.0 3600.0 86400.0 604800.0 2592000.
>DCYSCORE 1.0 0.0 0.0 1.0 1.0 1.0 USRTRACK
>DCYSCORE 3.0 0.0 0.0 2.0 2.0 1.0 USRTRACK
>USRTRACK -1. 7. +40. 4.0 +1.0 100. photon
>USRTRACK 1.000 0.001 &
>USRTRACK -1. 7. +41. 4.0 +1.0 100. photon
>USRTRACK 1.000 0.001 &
>RANDOMIZ 1.0
>START 10000.0
>STOP
>
>
Did you try to score the photon fluence during irradiation, without decay ?
To answer your question : decay should work with your entries.
But, I have not the sufficient knowledge to tell you if what you obtain
is normal or not, maybe some member of the FLUKA team will be able to
answer.
I wonder if its relevant to score fluence in a vaccum region... I don't
know. The only region which is able to produce residual nuclei which
will decay is the lead sphere. The fluence that you're trying to score
comes from those interactions with lead, right ? Maybe you could use
some USRBDX to check what happens to the boundaries... sorry I don't
really help you there...
Regards.
Sebastien
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