[Gate-users] source angle type

[Joon Young Suk]

>
>>
>> Hi all,
>> I am trying to simulate the scan with a cylindrical phantom which  
>> as two rod source inside.
>> I built two rod sources with cylindrical geometry and set the  
>> angle type as "iso".
>> I think the LORs should be randomly distributed through all 4pi  
>> angle, but the simulation doesn't look like that.
>>
>> From the display during the simulation, I can see most LORs are  
>> lying horizontally on the centre plane.
>>
>> Please check the image from the followed link :
>>
>> http://www.joonyoung.net/iso.jpg
>>
>> Also, here is my code for the source part.
>>
>> Please, let me know what should I do to correct it and make real  
>> isotropic emission.
>>
>> Thanks,
>> Joon Young Suk
>>
>> # S O U R C E S
>> /gate/source/addSource rodsource0
>> ###################################################################
>> /gate/source/rodsource0/setActivity {activity} becquerel
>> /gate/source/rodsource0/setType backtoback
>> /gate/source/rodsource0/gps/particle gamma
>> /gate/source/rodsource0/gps/energytype Mono
>> /gate/source/rodsource0/gps/monoenergy 0.511 MeV
>> /gate/source/rodsource0/gps/type Volume
>> /gate/source/rodsource0/gps/shape Cylinder
>> /gate/source/rodsource0/gps/radius 0.5 mm
>> /gate/source/rodsource0/gps/halfz 25.0 mm
>> /gate/source/rodsource0/gps/centre {rod0Xposition} 0. 0. mm
>> /gate/source/rodsource1/gps/angtype iso
>> /gate/source/rodsource0/gps/confine rod0_P
>>
>> /gate/source/addSource rodsource1
>> ###################################################################
>> /gate/source/rodsource1/setActivity {activity} becquerel
>> /gate/source/rodsource1/setType backtoback
>> /gate/source/rodsource1/gps/particle gamma
>> /gate/source/rodsource1/gps/energytype Mono
>> /gate/source/rodsource1/gps/monoenergy 0.511 MeV
>> /gate/source/rodsource1/gps/type Volume
>> /gate/source/rodsource1/gps/shape Cylinder
>> /gate/source/rodsource1/gps/radius 0.5 mm
>> /gate/source/rodsource1/gps/halfz 25.0 mm
>> /gate/source/rodsource1/gps/centre {rod1Xposition} 0. 0. mm
>> /gate/source/rodsource1/gps/angtype iso
>> /gate/source/rodsource1/gps/confine rod1_P
>>
>>
>
> Joon Young Suk
> Brain Research Centre
> Dept. of Physics,
> University of British Columbia
> 2211 Wesbrook Mall
> Vancouver, British Columbia
> Canada, V6T 2B5
>
> joon at physics.ubc.ca
> joonyoung.suk at gmail.com
>
> http://www.joonyoung.net
>
>
>
>

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