[Gate-users] GATE 7 metastable source definition

[Christopher Watanabe]

Hi all, 

I was wondering, given that the original post here was 5 years ago, whether methods now exist for simulating the metastable Tc99m, without simulating the Mo-99 decay scheme. This, for a Tc99m SPECT imaging simulation.

I realize in the GATE examples, this is simulated using a pure gamma, but I’m interested in checking the dose, minimal though it may be, of tissue as well. 

Thank you! 

Chris

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Hi,

you should take Mo-99, i.e. Z=42, A=99 instead, since Tc-99m
is part of the Mo-99 decay scheme. I have just tried it with
the Spectro-example of EduGATE and it gives a useful spectrum!

Also, if you use the physicslist mechanism for the physical processes you need to add:

/gate/physics/addPhysicsList emstandard
/gate/physics/addProcess RadioactiveDecay

Hope this is helpful for you!

Kind regards,

Uwe Pietrzyk

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On 30 Jan 2015, at 21:17, Xinchi Hou <monicaxinchi at gmail.com<mailto:monicaxinchi at gmail.com>> wrote:

Dear Gate-users,

I am using GATE 7 for SPECT simulations. For some reason, GATE 7 seems can not recognize metastable source by defining an ion source (shows below,Tc-99m as an example), which can be successfully run by GATE 6.1:

/gate/source/SourceTC99m/gps/particle ion
/gate/source/SourceTC99m/gps/ion 43 99 0 142.6833
/gate/source/SourceTC99m/gps/monoenergy 0 keV
/gate/source/SourceTC99m/setForcedUnstableFlag true
/gate/source/SourceTC99m/setForcedHalfLife 21640 s

I know we can define 140keV gamma as a source instead of using ion source. However, I need to use many of other metastable isotopes as sources which usually have multiple gamma energies for each of them.

I really appreciate if somebody could share his/her experience on similar problems.

My best regards,
Monica

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