[Gate-users] Problem in the number of the emited positrons by F18 point source

[Matthieu MOREAU]

Hi Mahdjoub Hamdi, 


how long are your simulations ? Because 10 Bq. have no sense without acquisition time. I think you have to choose longer acquisition time to have better statistic. 


Matthieu. 


--- 
Matthieu MOREAU, MSc 
PhD student in Nuclear Imaging 
CRCNA - UMR 892 - INSERM (France) // Ecole Nationale Vétérinaire de Nantes (France) ONIRIS - AMaROC - +33 (0) 2 40 68 40 05 

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De: "Mahdjoub Hamdi" <mahdjoub.hamdi at hotmail.fr> 
À: gate-users at lists.opengatecollaboration.org 
Envoyé: Vendredi 27 Septembre 2013 18:03:47 
Objet: [Gate-users] Problem in the number of the emited positrons by F18 point source 

Problem in the number of the emited positrons by F18 point source 
D ea r all Gate expert s and users , 
Le t ’ s first identify the problem , I need to count the total number of the emitted e+ by F18 source . For that I have simulated F18 point source placed in the center of water cylinder . T he information about the number of emitted events is ob t ained by using Gate in Tracker Mode . But the number of total emitted was not as specified by the comm a nd : /gate/source/Source/setActivity 1 0 becquerel . 
As an example, for 10 becquerel I obtain ed 12 e+, 17 e+ , 6e+, 15 e+ when I repeat ed execut ion of the same simulation 4 times always with 10 becquerel . 

And, if there is another way to track particles in the phantom I'll be Thankfu l . 
Here is my macro for the source : 
# SOURCE 1 # 
/gate/source/addSource fluor18 
/gate/source/fluor18/setActivity 1 0 . becquerel 
/gate/source/fluor18/gps/particle ion 
/gate/source/fluor18/gps/ion 9 18 0 0 
/gate/source/fluor18/setForcedUnstableFlag true 
/gate/source/fluor18/useDefaultHalfLife 
/gate/source/fluor18/gps/energytype Mono 
/gate/source/fluor18/gps/monoenergy 0 MeV 
/gate/source/fluor18/gps/angtype iso 
/gate/source/fluor18/gps/number 1 
/gate/source/fluor18/gps/centre 0. 0. 0. cm 
/gate/source/fluor18/gps/type Point 

Thank you in advance . 
Mahdjoub 
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