[Gate-users] Some news about the strange behaviour

[Simon Stute]

2008/2/5, Jasmine Schirmer <jasmine.schirmer at tum.de>:
>
> Dear Gate users and developers,
>
> At the end of last year, we reported strange behaviour in the energy
> spectra of singles and coincidences when using the newest version of Gate (
> 3.1.2). Since then, we have recently received a cluster system in our lab
> and would like to install Gate on this new system. Has the problem with Gate
> 3.1.2 been identified and solved?
>
> Thanks in advance,
> Jasmine Schirmer and Irene Torres


Hi all,

Sorry but I was very busy since the beginning of the year ...

The problem in energy spectra has been identified but not solved ... because
everything demonstrates that the different behaviours between Gate versions
are coming from the different Geant4 releases. It is not a problem of
coding, and nothing has changed between Gate versions concerning the
detection and the transportation, we just use the same Geant4 utilities, but
them, they are always changing.

Our cluster has encountered some problems but it will be soon functional. So
I will install Gate3.0.0 with Geant4.9.0 and Gate3.1.2 with
Geant4.8.0.p01and run the same tests. I think that it will
definitively answer the
question.

And concerning the intersector coincidences problem, I progressed since our
cluster was sick ! But it seems to be the same problem: coming from Geant4
versions ...

News are coming soon !

And to answer your question Irene and Jasmine, I think you may install the
last Gate version because all strange behaviours appear between Gate3.0.0and
Gate3.1.0, and in 3.0.0 there are no Cluster Tools also (if you plan to use
its). Moreover it depends on what you want to do in your applications but
the differences in energy spectra should not be harmful and the intersector
coincidences either (because I think those problems are only related to
crystal scattering and crystalSD behaviour), and moreover I think that you
will not use intersector coincidences for imaging :-)

Cheers,
Simon
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