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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- application/x-fluka attachment: ex7.inp
Received on Fri Jun 27 2014 - 08:18:48 CEST