Date: Mon, 21 Jul 2014 01:35:48 +0800
Dear Andrea,
I tried to look at the depth-dose distribution and it looks reasonable. however, I tried to look at the attenuation of photons of 1 MeV and 10 MeV by concrete using this input file, the runs gave me almost the same attenuation for 1 and 10 MeV which is puzzling. I also tried different energy neutrons, and they look the same, i.e. different energy neutrons have same attenuation. Is there anything I did wrong?
Thank you for your help!
Sherry
----- Original Message -----
From: Andrea.Mairani_at_mi.infn.it
Date: Sunday, July 13, 2014 10:27 pm
Subject: Re: [fluka-discuss]: simple fluka run
To: chorying <chorying_at_cityu.edu.hk>
Cc: "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
> Dear Sherry,
> Sorry for the late answer, I gave a quick look to your results and I do
> not see any real problem. Did you check the depth-dose distribution? How
> did it look for you?
> Cheers,
> Andrea
>
> > Dear Andrea,
> >
> > Thank you for your prompt reply. but then I am not very sure about the
> > results. I have another run with the usrbin option changed to coordinate,
> > however what I get now is that the dose after passing through the
> > polyethylene is greater than before the polyethylene, which does not
> make
> > much sense?
> >
> > .................................
> > 1
> > R - Z binning n. 1 "DoseTg1 " , generalized particle n.
> 228
> > R coordinate: from 0.0000E+00 to 1.0000E+00 cm, 1 bins (
> > 1.0000E+00 cm wide)
> > Z coordinate: from 0.0000E+00 to 1.0000E-06 cm, 1 bins (
> > 1.0000E-06 cm wide)
> > axis coordinates: X = 0.0000E+00, Y = 0.0000E+00 cm
> > Data follow in a matrix A(ir,iz), format (1(5x,1p,10(1x,e11.4)))
> >
> > accurate deposition along the tracks requested
> > this is a track-length binning
> > 1.4041E-05
> >
> > Percentage errors follow in a matrix A(ir,iz), format
> > (1(5x,1p,10(1x,e11.4)))
> >
> > 1.9296E+01
> > 1
> > R - Z binning n. 2 "DoseTg2 " , generalized particle n.
> 228
> > R coordinate: from 0.0000E+00 to 1.0000E+00 cm, 1 bins (
> > 1.0000E+00 cm wide)
> > Z coordinate: from 1.0000E+01 to 1.0000E+01 cm, 1 bins (
> > 1.0000E-06 cm wide)
> > axis coordinates: X = 0.0000E+00, Y = 0.0000E+00 cm
> > Data follow in a matrix A(ir,iz), format (1(5x,1p,10(1x,e11.4)))
> >
> > accurate deposition along the tracks requested
> > this is a track-length binning
> > 8.9617E-05
> >
> > Percentage errors follow in a matrix A(ir,iz), format
> > (1(5x,1p,10(1x,e11.4)))
> >
> > 3.7753E+00
> >
> > ...........................................................
> > I will expect the dose to be attenuated after passing through the
> > polyethylene, and I have scored the neutron fluence by USRBDX card,
> and
> > the fluence is reduced. So I am not sure how to interpret the
> results. Any
> > suggestion?
> >
> > thank you again!
> >
> > Sherry
> >
> >
> > ----- Original Message -----
> > From: Andrea.Mairani_at_mi.infn.it
> > Date: Friday, June 27, 2014 5:05 am
> > Subject: Re: [fluka-discuss]: simple fluka run
> > To: chorying <chorying_at_cityu.edu.hk>
> > Cc: "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>,
> > ngchoryi_at_yahoo.com
> >
> >
> >> Dear Sherry,
> >>
> >>
> >> > .....................................
> >> > Region binning n. 1 "DoseTg1 " , generalized particle n.
> 228
> >> > 2 bins corresponding to the region sets:
> >> > from region 2 to region 3 in step of 1 regions,
> or
> >> > from region 0 to region 0 in step of 1 regions,
> or
> >> > from region 0 to region 0 in step of 1 regions
> >> > Data follow in an array A(ir), format (1(5x,1p,10(1x,e11.4)))
> >> >
> >> > accurate deposition along the tracks requested
> >> > this is a track-length binning
> >> > 3.0224E-11 3.2834E-03
> >> >
> >> > Percentage errors follow in an array A(ir), format
> >> > (1(5x,1p,10(1x,e11.4)))
> >> >
> >> > 1.2185E+01 1.1326E-01
> >> > ......................................
> >> > does that mean dose is 1.2185E+01 Gy?
> >> From the manual:
> >> DOSE 228 Dose (energy deposited per unit mass,
> >> GeV/g)
> >> remember the results are per primary history. And "13) The results
> from
> >> USRBIN are normalised per unit volume and per unit primary weight,
> >> except
> >> for region binnings and special user-defined binnings which are
> >> normalised
> >> per unit primary weight only,.."
> >>
> >> Moreover 1.2185E+01 is the percentage error as properly reported:
> >> "Percentage errors follow in an array A(ir), format
> >> (1(5x,1p,10(1x,e11.4)))
> >> 1.2185E+01 1.1326E-01".
> >> Look that you are scoring in region nr 2 and region 3 (while in the
> >> other
> >> USRBIN in region 3 and 4)
> >>
> >> Cheers,
> >> Andrea
> >>
> >>
> >
> >
> >
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>
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- application/x-fluka attachment: ex7_1.inp
- application/x-fluka attachment: ex7_2.inp
(image/jpeg attachment: 1MeV10MeVDepthDose.jpg)