[Gate-users] GATE 7 metastable source definition
Mercedes Rodriguez
mercedes at fisica.unam.mx
Tue May 26 17:57:36 CEST 2020
Hi Josh,
I think your simulation is including the beta decay of Tc-99 to Ru-99
(Ebeta_max=294 keV). Have a look at:
http://www.lnhb.fr/nuclides/Tc-99_tables.pdf
Regards,
Mercedes
On 2020-05-26 10:08 a. m., Josh Knowland wrote:
>
> Hi Matthew, thank you very much for the response.
>
> I have simulated a test case using the code you gave. Here is my
> source def:
>
> /gate/source/addSource src_PointSource
>
> /gate/source/src_PointSource/gps/particle ion
>
> /gate/source/src_PointSource/gps/ion 43 99 0 142.6832
>
> /gate/source/src_PointSource/gps/energytype Mono
>
> /gate/source/src_PointSource/gps/monoenergy 0 keV
>
> /gate/source/src_PointSource/setForcedUnstableFlag true
>
> /gate/source/src_PointSource/setForcedHalfLife 21624.129 s
>
> /gate/source/src_PointSource/setActivity 0.027027 mCi
>
> /gate/source/src_PointSource/gps/type Point
>
> /gate/source/src_PointSource/gps/centre 0.000 0.000 0.000 mm
>
> /gate/source/src_PointSource/gps/angtype iso
>
> That point source is surrounded by a cubic meter of water that is
> assigned to be a sensitive detector:
>
> /gate/world/daughters/name MeterCube
>
> /gate/world/daughters/systemType scanner
>
> /gate/world/daughters/insert tessellated
>
> /gate/MeterCube/geometry/setPathToSTLFile ../STL_Files/MeterCube.stl
>
> /gate/MeterCube/setMaterial Water
>
> /gate/MeterCube/attachCrystalSD
>
> Within the sensitive detector cube, I get hits which visually look
> right. Here is a side view:
>
> But, the energy spectrum looks like this:
>
> The vertical step is at the excitation energy of 143 keV.
>
> Is that right? What is causing the odd energy spectrum?
>
> Below is the full listing of my code:
>
> */gate/geometry/setMaterialDatabase ../my_Materials.txt*
>
> */gate/world/geometry/setXLength 1000 mm*
>
> */gate/world/geometry/setYLength 1000 mm*
>
> */gate/world/geometry/setZLength 1000 mm*
>
> */gate/world/setMaterial Water*
>
> **
>
> */gate/world/daughters/name MeterCube*
>
> */gate/world/daughters/systemType scanner*
>
> */gate/world/daughters/insert tessellated*
>
> */gate/MeterCube/geometry/setPathToSTLFile ../STL_Files/MeterCube.stl*
>
> */gate/MeterCube/setMaterial Water*
>
> */gate/MeterCube/attachCrystalSD*
>
> **
>
> */gate/physics/addPhysicsList emstandard_opt4*
>
> */gate/physics/addProcess RadioactiveDecay*
>
> **
>
> */gate/random/setEngineName MersenneTwister*
>
> */gate/random/setEngineSeed auto*
>
> */gate/run/initialize*
>
> **
>
> */gate/source/addSource src_PointSource*
>
> */gate/source/src_PointSource/gps/particle ion*
>
> */gate/source/src_PointSource/gps/ion 43 99 0 142.6832*
>
> */gate/source/src_PointSource/gps/energytype Mono*
>
> */gate/source/src_PointSource/gps/monoenergy 0 keV*
>
> */gate/source/src_PointSource/setForcedUnstableFlag true*
>
> */gate/source/src_PointSource/setForcedHalfLife 21624.119140625 s*
>
> */gate/source/src_PointSource/setActivity 0.027027 mCi*
>
> */gate/source/src_PointSource/gps/type Point*
>
> */gate/source/src_PointSource/gps/centre 0.000 0.000 0.000 mm*
>
> */gate/source/src_PointSource/gps/angtype iso*
>
> **
>
> */gate/digitizer/Singles/insert adder*
>
> **
>
> */gate/output/ascii/enable*
>
> */gate/output/ascii/setFileName Test_*
>
> */gate/output/ascii/setOutFileSinglesFlag 1*
>
> */gate/output/ascii/setOutFileHitsFlag 0*
>
> **
>
> */gate/output/allowNoOutput*
>
> */gate/application/setTimeSlice 1.0 s*
>
> */gate/application/setTimeStart 0.0 s*
>
> */gate/application/setTimeStop 1.0 s*
>
> **
>
> */gate/application/startDAQ*
>
> *From:* Matthew Strugari <matthew.strugari at dal.ca>
> *Sent:* Tuesday, May 26, 2020 9:58 AM
> *To:* Josh Knowland <jknowland at lucernodynamics.com>; Christopher
> Watanabe <ge69kec at mytum.de>; gate-users at lists.opengatecollaboration.org
> *Subject:* Re: [Gate-users] GATE 7 metastable source definition
>
> Hi Josh,
>
> There are a couple options for simulating gamma emissions from Tc-99m.
> One of which uses the ion source:
>
> /gate/source/ [ source name ] /gps/particle ion
>
> /gate/source/ [ source name ] /gps/ion 43 99 0 142.6832
>
> /gate/source/ [ source name ] /setForcedUnstableFlag true
>
> /gate/source/ [ source name ] /useDefaultHalfLife
>
> /gate/source/ [ source name ] /setActivity 10 MBq
>
> An alternative and speedier option, if you are not concerned about
> dosimetry within your source volume, would be to use a gamma source
> defined in the UserSpectrum:
>
> /gate/source/ [ source name ] /gps/particle gamma
>
> /gate/source/ [ source name ] /gps/energytype UserSpectrum
>
> /gate/source/ [ source name ] /gps/setSpectrumFile
> data/energy_spectrum_Tc99m.txt
>
> /gate/source/ [ source name ] /setForcedHalfLife 21625.848 s
>
> /gate/source/ [ source name ] /setActivity 8.85244 MBq
>
> Here, your energy spectrum file would look like:
>
> # Gamma spectrum for Technetium 99m from LNE-LNHB/CEA Table de
> Radionucleides
>
> # (first line is 1 0 to say it is a discrete spectrum)
>
> # Three next lines : 89.6 keV, 140.511 keV, and 142.675 KeV
>
> 1 0
>
> 0.0896 0.000014
>
> 0.140511 0.885
>
> 0.142675 0.00023
>
> Both configurations above would simulate a 10 MBq Tc-99m source. In
> the former case, you would set your activity as desired. In the latter
> case, you would scale your activity by the sum of all branching ratios
> to account only for the gamma portion of radioactivity.
>
> Cheers,
>
> Matthew
>
> ------------------------------------------------------------------------
>
> *From:*Gate-users <gate-users-bounces at lists.opengatecollaboration.org>
> on behalf of Josh Knowland <jknowland at lucernodynamics.com>
> *Sent:* May 26, 2020 10:35 AM
> *To:* Christopher Watanabe <ge69kec at mytum.de>;
> gate-users at lists.opengatecollaboration.org
> <gate-users at lists.opengatecollaboration.org>
> *Subject:* Re: [Gate-users] GATE 7 metastable source definition
>
> *CAUTION:*The Sender of this email is not from within Dalhousie.
>
> 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
>
> /----------------------------------------------------------------------
> Prof. Dr. Uwe Pietrzyk
> Diplom-Physiker
> Institut für Neurowissenschaften und Medizin / INM-4
> Forschungszentrum Jülich GmbH
> 52425 Jülich
> Tel: +49-2461-61 4763
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> &
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> Fachbereich C - Physik / D.08.01
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> eMail:Uwe.Pietrzyk at physik.uni-wuppertal.de <http://lists.opengatecollaboration.org/mailman/listinfo/gate-users><mailto:Uwe.Pietrzyk at physik.uni-wuppertal.de <http://lists.opengatecollaboration.org/mailman/listinfo/gate-users>>
> http://www.medizinphysik.uni-wuppertal.de<http://www.medizinphysik.uni-wuppertal.de/ <http://www.medizinphysik.uni-wuppertal.de%3chttp:/www.medizinphysik.uni-wuppertal.de/>>
> ----------------------------------------------------------------------/
>
> 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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> Gate-users at lists.opengatecollaboration.org
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--
Mercedes Rodriguez-Villafuerte, PhD
Instituto de Fisica, UNAM
AP 20-364, 01000 CDMX
Mexico
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