hello,
i hope i find you well, i am a fluka beginner, i found your lecture notes
on the link that you provided to be useful. may you please send me some
more basic tutorials for beginners. especially on scoring.
Regards
Witness Chirume
On 5 March 2018 at 13:08, Francesc Salvat-Pujol <
francesc.salvat.pujol_at_cern.ch> wrote:
> Dear Riya,
>
> I have not seen your input file, so I shall assume you have a beam of
> whichever particles impinging on a sphere in vacuum with no additional
> regions other than a surrounding blackhole and that you are indeed
> scoring fluence. I naively suspect your problem is the following.
>
> If you score fluence using USRBDX with one-way scoring vacuum->sphere,
> you are only scoring surface-crossing events on the first half of the
> spherical surface, as the other half corresponds to sphere->vacuum.
> Thus, you are a factor ~2 short if you want the fluence through the
> whole spherical surface.
>
> If you use USRTRACK, the fluence scoring is done by accumulating track
> lengths within the sphere (and dividing by the sphere volume in the end
> etc). Thus, here you pick up the whole passage through the sphere, not
> just the entrance as above, hence (probably) the observed discrepancy.
>
> Feel free to take a look e.g. at
> https://indico.cern.ch/event/604018/contributions/2435691/at
> tachments/1395454/2242757/08_Scoring_2017.pdf
>
> Cheers,
>
> Cesc
>
>
>
> On Mon, Mar 05 2018, at 14:22 +0530, riya dey wrote:
>
>>
>> Dear Experts,
>>
>> If I put 4*pi*r^2 as area in USRBDX ( with one way scoring) and
>> 4/3*pi*r^3
>> as volume of the spherical detector in USRTRACK , then the result in
>> USRTRACK is appearing to be 2 times the value from USRBDX.
>>
>> Both the values should be the same theoretically. Why is this discrepancy
>> happening ?
>>
>>
>>
>> With regards,
>>
>> Riya Dey
>>
>>
>>
>> From: riya dey [mailto:riyadey_at_barc.gov.in]
>> Sent: 05 March 2018 13:47
>> To: 'fluka-discuss_at_fluka.org' <fluka-discuss_at_fluka.org>
>> Subject: EXPRESSIONN OF AREA USED IN USRBDX CARD
>>
>>
>>
>> Dear FLUKA Experts,
>>
>>
>>
>> Suppose I want to calculate the fluence from vacuum to a spherical
>> target .
>> What should be the expression for area that has to be given in USRBDX
>> card
>> ?? Is it 4*pi*r^2 or pi*r^2 ??
>>
>>
>>
>> Note : Fluence is defined as dN/dA where dN the number of particles
>> incident
>> on a sphere of cross-sectional area dA. And the cross sectional area of a
>> sphere is pi*r^2 .
>>
>>
>>
>> With regards,
>>
>> Riya Dey
>>
>>
> --
> Francesc Salvat Pujol
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> Tel: +41 22 76 64011
> Fax: +41 22 76 69474
>
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Received on Fri Mar 09 2018 - 13:37:24 CET