[gate-users] source of germanium68

[Eric Vandervoort]

Hi Ross,
The simplest way I can think of is to just modify the source macros to
have seperate beta and gamma sources in the same physical location. You
could just scale the activities of each source by their intensities. So
for Ga-68 would use your existing beta spectra with 88% of the total
activity and then add the important gammas using monoenergetic gamma
sources. I guess the important one is the 3% intensity 1077 KeV gamma. It
doesn't look like it would be very easy to add a mixed gamma and beta
particle source to GateGeneralParticleSource.cc. I've been trying to
avoid hacking the Gate code unless absolutely necessary.
Best Regards,
Eric


On Mon, 13 Jun 2005, Schmidtlein, Ross/Sloan-Kettering Institute wrote:

> Hi Eric,
>
> Adding the decay gamma's would make this source pretty complete.
I wasn't quite sure how to add them so I never went any further
with it.  If you have any ideas on how to do this it might serve
as a template for adding other e+ decays with cascade gamma's such
as Y-86.  Any ideas?
>
> ross
>
> -----Original Message-----
> From: gate-users-bounces at lphe1pet1.epfl.ch [mailto:gate-users-bounces at lphe1pet1.epfl.ch] On Behalf Of Eric Vandervoort
> Sent: Monday, June 13, 2005 2:50 PM
> To: GATE feedback and helpline for Users
> Subject: RE: [gate-users] source of germanium68
>
>
> Hello Ross and Murial,
> Thanks for the code, Ross. It looks like your spectra are much closer to the exerimental Ge68/Ga68 spectra than what I've been using. Thanks, Eric
>
> On Mon, 13 Jun 2005, Schmidtlein, Ross/Sloan-Kettering Institute wrote:
>
> > Hi Eric and Murial,
> >
> > I added a Ge68/Ga68 source a while back it may be in the archives (I
> > ignored the gamma's but I did add a specific output for each beta
> > decay branch).
> >
> > ross
> >
> > Original Message....
> > Hi Sebastien,
> >
> > I completed modifying the code to better represent the spectrum for
> positron emission from Ga-68.  The details are commented in the code. I checked it against http://ie.lbl.gov/toi.html and it looks very close.
> >
> > ross
> >
> > -----Original Message-----
> > From: gate-users-bounces at lphe1pet1.epfl.ch
> > [mailto:gate-users-bounces at lphe1pet1.epfl.ch] On Behalf Of evander at phas.ubc.ca
> > Sent: Monday, June 13, 2005 1:49 PM
> > To: GATE feedback and helpline for Users
> > Cc: mviala at clermont.in2p3.fr; gate-users at lphe1pet1.epfl.ch
> <> Subject: Re: [gate-users] source of germanium68
> >
> >
> > Hi Murial,
> > I've added a Ge-68 Beta-energy spectrum to Gate. I attached the source
> > code to this email. Just put the files with extensions .cc in the gate/src/ and the .hh files in your gate/include directory, and recompile Gate. You can get the right germanium spectrum and half-life by using the
> > commands:
> >
> > /gate/source/LINE/setForcedHalfLife 2.34101E+007 s
> > /gate/source/LINE/gps/energytype Germanium68
> >
> > I've emailed you directly so you will get the attachments but I
> > imagine that these attachments will be scrubbed for the other
> > gate-users.  If anybody else wants them, I guess you can email me
> > directly.
> >
> > One thing I should note, though: I've used a different model for the
> > energy spectrum than the other Gate beta spectra. I just use the Fermi spectrum for the kinetic energy (KE) of the beta:
> > KE=sqrt(K^2+2*K*(0.511))(K_max-K)^2(K+0.511) with K_max = 1.899 MeV. Gate uses some other model that I can't get the reference for (Behrens H and Janecke J 1969 "Numerical Tables for Beta-Decay and Electron Capture Landolt-Börnstein, New Series, Group I" vol 4 ed H Schopper, Berlin: Springer). My equation is praobably good enough for most purposes... it gives pretty much the right spectrum and close to the correct mean (the Fermi mean = 0.800 MeV and the experimental mean 0.836 MeV), but it probably could be a bit more accurate.
> >
> > Best Regards,
> > Eric
> >
> >
> > >
> > >
> > > Hi all,
> > >
> > > I need to know how the spectrum of energy within Gate is coded.
> > > Which are the emission lines which you took into account?
> > >
> > > I must use a source of germanium68.
> > > Which are the lines which I must take into account to code them in
> > > Gate?
> > >
> > > Best regards,
> > >
> > >
> > > Muriel
> > > _______________________________________________
> > > gate-users mailing list
> > > gate-users at lphe1pet1.epfl.ch
> > > http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users
> > >
> >
>
> _______________________________________________
> gate-users mailing list
> gate-users at lphe1pet1.epfl.ch http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users
>
>
>
> _______________________________________________
> gate-users mailing list
> gate-users at lphe1pet1.epfl.ch
> http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users
>