Re: [fluka-discuss]: simple fluka run

From: <Andrea.Mairani_at_mi.infn.it>
Date: Sun, 13 Jul 2014 16:27:13 +0200

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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Received on Sun Jul 13 2014 - 18:22:52 CEST