Dear Raushan,
your main point of confusion is related to something that has been
discussed at length in this forum, (one of) the last time(s) by Anna:
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/10384.html
The USRTRACK output is per cm^2 only if you have input the region volume -
that FLUKA does not calculate - in the respective card field. This is not
your case, so your differential values are actually expressed as cm s^-1
GeV^-1, representing a differential photon tracklength rate. The energy
integrated value, which you can conveniently find in the *sum.lis file
generated at post-processing level, is in cm/s (decay photon tracklength
rate).
To get a fluence rate (cm^-2 s^-1), you need to divide by the region
volume. This does not imply to rerun, you can do it yourself on your
present results. Looking at your problem, the concerned region seems to
have a volume of 6.4 mm^3, so your numbers have to be multiplied by
156.25 (cm^-3).
Kind regards
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854
On Wed, 26 Jul 2017, kabytayeva wrote:
> Hello everybody!
> I'm a little confused in the measurements.
>
> I am interested in the rad decay of the created 180Ta in the next reaction
> 181Ta(gamma,n)180Ta
>
>
> I use USRTRACK and need to get results of 23bin in : photons/cm2/s. According
> to the manual the results of a USRTRACK track-length estimator are always
> given as differential distributions of fluence in energy, in units of cm −2
> GeV −1 per incident primary. I add IRRPROFI and DSYSCORE and automatically I
> get photons/cm2/s/GEV. In order to get results in photons/cm2/s I need to
> divide Y value on 1000, is not it? (I confused because of if I divide on 1000
> it is not agree with experimental value, but if I divide on 100 all agree
> with experiment.) Does the FLAIR command which help me normalise value?
>
>
> Many thanks
>
> I attach input file
>
>
>
> Best regards, Raushan Kabytayeva
>
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Received on Wed Jul 26 2017 - 18:52:04 CEST