Dear Agnieszka,
I suspect that you look at the USRTRACK differential value (cm-2 GeV-1)
rather than at the integral fluence value (cm-2) - available in the
sum.lis file -. With one bin only and Emax beyond the electron energy
physical limit, evidently the first goes down as 1/Emax for increasing
Emax, while the latter is unchanged.
I'd also consider to score energy deposition in the ionization chamber
gas region.
Cheers
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. +41 22 7678962
fax +41 22 7668854
On Wed, 4 Oct 2017, Agnieszka Witkowska wrote:
> Dear Francesco,
> Thank You, I think that I implemented everything needed, however my results of the
> simulations are strange, as depending on the Emax which I put in the USRTRACK
> scoring card they are changing a lot - with increasing Emax in USRTRACK, results
> of the fluence are decreasing. Moreover, results with radioactive isotope are
> differing a lot comparing to my previous simulations witn monoenergetic beams
> (main lines of the isotopes).
>
> Can You please have a quick look at my input file (attached) and advise what might
> be wrong in it?
>
> I am trying to score electrons in ionization chamber by card USRTRACK with isotope
> of Co60.
>
> Best regards,
> Agnieszka
>
> 2017-10-03 22:25 GMT+02:00 Francesco Cerutti <Francesco.Cerutti_at_cern.ch>:
>
> Dear Agnieszka,
>
> when I am using option BEAM/SDUM=ISOTOPE, what will be my
> BEAM/WHAT(1) energy? Will it be the energy of the main
> energy line for the isotope?
>
>
> no, it's meaningless, see the manual (BEAM card, SDUM).
>
> Is it also mandatory to use card DCYSCORE while using
> RADDECAY/WHAT(1)=Semi-Analogue?
>
>
> yes, but read carefully the manual (BEAM card, note 8)
>
> Best
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. +41 22 7678962
> fax +41 22 7668854
>
> On Tue, 3 Oct 2017, Agnieszka Witkowska wrote:
>
> Dear Francesco,
> Thank You a lot for advise, radioactive source is exactly
> the option I was looking
> for! I have one additional question as I am a little bit
> confused, when I am using
> option BEAM/SDUM=ISOTOPE, what will be my BEAM/WHAT(1)
> energy? Will it be the
> energy of the main energy line for the isotope?
>
> Is it also mandatory to use card DCYSCORE while using
> RADDECAY/WHAT(1)=Semi-Analogue?
>
> Thank You for your help in advance.
>
> Best regards,
> Agnieszka Witkowska
>
> 2017-10-02 12:05 GMT+02:00 Francesco Cerutti
> <Francesco.Cerutti_at_cern.ch>:
>
> Dear Agnieszka,
>
> are you interested in decay alphas? Or photons and
> electrons?
> The latter ones can be directly obtained - all along
> the decay chain -
> by implementing in the input file your Ra isotope as
> radioactive
> source (BEAM/SDUM=ISOTOPE, HI-PROPE with respective
> Z and A,
> RADDECAY/WHAT(1)=2.0 i.e. semi-analogue), with no
> need for the source
> user routine.
>
> Conversely, for the alphas - with the present FLUKA
> version - you
> actually need to implement your source.f, which is
> more challenging.
>
> 3. source.f requires several variables (weight,
> polarization, ...) to
> be set, but they are already filled by default, so
> you shall change
> only the ones relevant to your case (i.e. the
> particle kinetic
> energy/momentum)
>
> 2. decay spectrum data are available for instance at
> http://www.nndc.bnl.gov/
> An external file can be in whatsoever format, since
> it's up to you to
> properly read its content inside source.f and
> appropriately store the
> relevant info.
>
> 1. if you are interested in sampling decay alphas,
> you should set in
> the BEAM card 4-HELIUM as beam particle and assign
> in source.f its
> kinetic energy and momentum according to your data,
> selecting a fixed
> experimental energy value on the basis of the
> respective branching
> ratio. This requires some programming skills.
>
> Kind regards
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. +41 22 7678962
> fax +41 22 7668854
>
> On Sun, 1 Oct 2017, Agnieszka Witkowska wrote:
>
> Dear Fluka Users,
> I am the beginner in terms of Fluka usage and
> I am trying
> to implement spectrum of radium
> as a beam by using user routine source.f. I
> have read
> manual and Fluka courses
> presentations, however it is still not clear
> for me how to
> implement such feature. Can You
> please help me with questions below?
>
> 1. How to assign beam to the data read from
> the file?
> 2. Can You please advise where can I find
> files with
> spectrum properties? As I understand
> files which can be included in source routine
> should be in
> collision type?
> 3. I would like to modify only the energy of
> the beam to
> create spectrum as a source. Do I
> have to include in the source routine other
> parameters
> definitions like weight of the
> particle, polarization etc. or I can omit them
> and the
> routine will work?
>
> Thank You for your help in advance.
>
> Best regards,
> Agnieszka Witkowska
>
>
>
>
>
>
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Received on Thu Oct 05 2017 - 00:32:58 CEST