[Gate-users] GATE 7 metastable source definition

[Josh Knowland]

Gate Users,
Is there any update on this? Simulation of Tc99m without going through Mo-99 decay?
What is the best practice for this situation?

-josh


From: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> On Behalf Of Christopher Watanabe
Sent: Thursday, January 30, 2020 3:53 PM
To: gate-users at lists.opengatecollaboration.org
Subject: Re: [Gate-users] GATE 7 metastable source definition

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

/----------------------------------------------------------------------------------------------------------

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<http://lists.opengatecollaboration.org/mailman/listinfo/gate-users><mailto:monicaxinchi at gmail.com<http://lists.opengatecollaboration.org/mailman/listinfo/gate-users>>> 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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