[Gate-users] Best physics list for positron annihilation.

[Pietrzyk, Uwe]

Dear Andrea,

there is nothing wrong with your macros and the findings can be
explained by basic physics:

you have placed a Na-22 source in the middle of a small cylinder
with Rmax= 12mm and height of 6mm and PMMA as material.
The cylinder is defined as detector.

Starting the visualisation I can see:
- blue lines, i.e. positively charged particles, obviously positrons whose
energy was too high to be stopped in the PMMA.

- green lines are the annihilation photons since only some of them are
stopped in the very small cylinder but most of them can escape.

Using ROOT to read the root-file, there is a simple means to check
for all processes that happened (processName).

To study the effect of the positron range and SEE the distribution of the
emitted positrons before annihilation, we have prepared a special
Module for EduGATE (all for free and found on the GATE homepage),
called MR_PET, which besides showing the effect of charged particles
in the magnetic field, can also be used (with the B-field being set to 0.0T)
to study their spatial distribution. We have built in an option to switch off
the annihilation to ease the visualisation without the green lines from
the annihilation photons.

I hope this is helpful for you!

Kind regards and best wishes,

Uwe Pietrzyk

/----------------------------------------------------------------------
Prof. Dr. Uwe Pietrzyk
Diplom-Physiker
Institut für Neurowissenschaften und Medizin / INM-4
Forschungszentrum Jülich GmbH
52425 Jülich
Tel: +49-2461-61 4763
Fax: +49-2461-61 2820
Mobil: +49-162-103-4871
eMail: U.Pietrzyk at fz-juelich.de<mailto:U.Pietrzyk at fz-juelich.de>
http://www.fz-juelich.de/inm/inm-4/DE/Home/home_node.html
&
Bergische Universität Wuppertal
Fakultät für Mathematik und Naturwissenschaften
Büro:  D.08.01
Gaußstr. 20
42097 Wuppertal
Tel: +49-(0)202-439-3523
Fax: +49-(0)202-439-2811
eMail: Uwe.Pietrzyk at uni-wuppertal.de<mailto:Uwe.Pietrzyk at physik.uni-wuppertal.de>
http://www.medizinphysik.uni-wuppertal.de<http://www.medizinphysik.uni-wuppertal.de/>
----------------------------------------------------------------------/

On 17 Nov 2015, at 12:22, Andrea González <andreita_5_92 at hotmail.com<mailto:andreita_5_92 at hotmail.com>> wrote:


My version is vGATE 3.0
Ok, I attached my macros, if you can try I will be very pleased.

Thank you again!


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Forschungszentrum Juelich GmbH
52425 Juelich
Sitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher
Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
Prof. Dr. Sebastian M. Schmidt
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