[gate-users] source of germanium68

[Schmidtlein, Ross/Sloan-Kettering Institute]

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
>
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