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<p class="MsoNormal">Hi Matthew, thank you very much for the response. <o:p></o:p></p>
<p class="MsoNormal">I have simulated a test case using the code you gave. Here is my source def:<o:p></o:p></p>
<p class="MsoNormal">
<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/addSource src_PointSource<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/gps/particle ion<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/gps/ion 43 99 0 142.6832<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/gps/energytype Mono<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/gps/monoenergy 0 keV<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/setForcedUnstableFlag true<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/setForcedHalfLife 21624.129 s<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/setActivity 0.027027 mCi<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/gps/type Point<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/gps/centre 0.000 0.000 0.000 mm<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/source/src_PointSource/gps/angtype iso<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">That point source is surrounded by a cubic meter of water that is assigned to be a sensitive detector:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/world/daughters/name MeterCube<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/world/daughters/systemType scanner<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/world/daughters/insert tessellated<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/MeterCube/geometry/setPathToSTLFile ../STL_Files/MeterCube.stl<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/MeterCube/setMaterial Water<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">/gate/MeterCube/attachCrystalSD<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Within the sensitive detector cube, I get hits which visually look right. Here is a side view:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img width="257" height="253" style="width:2.677in;height:2.6354in" id="Picture_x0020_1" src="cid:image003.png@01D6334E.0C01AB70"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But, the energy spectrum looks like this:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img width="378" height="289" style="width:3.9375in;height:3.0104in" id="Picture_x0020_3" src="cid:image004.png@01D6334E.0C01AB70"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The vertical step is at the excitation energy of 143 keV.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is that right? What is causing the odd energy spectrum? <o:p>
</o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Below is the full listing of my code:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/geometry/setMaterialDatabase ../my_Materials.txt<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/world/geometry/setXLength 1000 mm<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/world/geometry/setYLength 1000 mm<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/world/geometry/setZLength 1000 mm<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/world/setMaterial Water<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/world/daughters/name MeterCube<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/world/daughters/systemType scanner<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/world/daughters/insert tessellated<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/MeterCube/geometry/setPathToSTLFile ../STL_Files/MeterCube.stl<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/MeterCube/setMaterial Water<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/MeterCube/attachCrystalSD<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/physics/addPhysicsList emstandard_opt4<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/physics/addProcess RadioactiveDecay<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/random/setEngineName MersenneTwister<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/random/setEngineSeed auto<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/run/initialize<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/addSource src_PointSource<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/gps/particle ion<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/gps/ion 43 99 0 142.6832<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/gps/energytype Mono<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/gps/monoenergy 0 keV<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/setForcedUnstableFlag true<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/setForcedHalfLife 21624.119140625 s<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/setActivity 0.027027 mCi<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/gps/type Point<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/gps/centre 0.000 0.000 0.000 mm<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/source/src_PointSource/gps/angtype iso<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/digitizer/Singles/insert adder<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/output/ascii/enable<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/output/ascii/setFileName Test_<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/output/ascii/setOutFileSinglesFlag 1<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/output/ascii/setOutFileHitsFlag 0<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/output/allowNoOutput<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/application/setTimeSlice 1.0 s<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/application/setTimeStart 0.0 s<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/application/setTimeStop 1.0 s<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>/gate/application/startDAQ<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Matthew Strugari <matthew.strugari@dal.ca> <br>
<b>Sent:</b> Tuesday, May 26, 2020 9:58 AM<br>
<b>To:</b> Josh Knowland <jknowland@lucernodynamics.com>; Christopher Watanabe <ge69kec@mytum.de>; gate-users@lists.opengatecollaboration.org<br>
<b>Subject:</b> Re: [Gate-users] GATE 7 metastable source definition<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hi Josh,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">There are a couple options for simulating gamma emissions from Tc-99m. One of which uses the ion source:<o:p></o:p></span></p>
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<blockquote style="margin-left:30.0pt;margin-right:0in">
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/ [ source name ] /gps/particle ion<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/<span style="background:white"> [ source name ] </span>/gps/ion 43 99 0 142.6832<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/<span style="background:white"> [ source name ] </span>/setForcedUnstableFlag true<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/<span style="background:white"> [ source name ] </span>/useDefaultHalfLife<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/ <span style="background:white">[ source name ]</span> /setActivity 10 MBq<o:p></o:p></span></p>
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</blockquote>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">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:<o:p></o:p></span></p>
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<blockquote style="margin-left:30.0pt;margin-right:0in">
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/<span style="background:white"> [ source name ] </span>/gps/particle gamma<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/<span style="background:white"> [ source name ] </span>/gps/energytype UserSpectrum<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/<span style="background:white"> [ source name ] </span>/gps/setSpectrumFile data/energy_spectrum_Tc99m.txt<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">/gate/source/<span style="background:white"> [ source name ] </span>/setForcedHalfLife 21625.848 s<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black;background:white">/gate/source/ [ source name ] /setActivity 8.85244 MBq</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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</blockquote>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Here, your energy spectrum file would look like:<o:p></o:p></span></p>
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<blockquote style="margin-left:30.0pt;margin-right:0in">
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"># Gamma spectrum for Technetium 99m from LNE-LNHB/CEA Table de Radionucleides<o:p></o:p></span></p>
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<blockquote style="margin-left:30.0pt;margin-right:0in">
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"># (first line is 1 0 to say it is a discrete spectrum)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"># Three next lines : 89.6 keV, 140.511 keV, and 142.675 KeV<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">1 0<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">0.0896 0.000014<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">0.140511 0.885<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">0.142675 0.00023<o:p></o:p></span></p>
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</blockquote>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black;background:white">Both configurations above would simulate a 10 MBq Tc-99m source. </span><span style="color:black">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.</span>
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="color:black">Cheers,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black">Matthew</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Gate-users <gate-users-bounces@lists.opengatecollaboration.org> on behalf of Josh Knowland <jknowland@lucernodynamics.com><br>
<b>Sent:</b> May 26, 2020 10:35 AM<br>
<b>To:</b> Christopher Watanabe <ge69kec@mytum.de>; gate-users@lists.opengatecollaboration.org <gate-users@lists.opengatecollaboration.org><br>
<b>Subject:</b> Re: [Gate-users] GATE 7 metastable source definition</span> <o:p>
</o:p></p>
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<p class="MsoNormal" style="line-height:12.0pt"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:white">CAUTION:</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:white"> The Sender of this email is not from within
Dalhousie.<o:p></o:p></span></p>
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<p class="xmsonormal">Gate Users,<o:p></o:p></p>
<p class="xmsonormal">Is there any update on this? Simulation of Tc99m without going through Mo-99 decay?<o:p></o:p></p>
<p class="xmsonormal">What is the best practice for this situation?<o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal">-josh<o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="xmsonormal"><b>From:</b> Gate-users <gate-users-bounces@lists.opengatecollaboration.org>
<b>On Behalf Of </b>Christopher Watanabe<br>
<b>Sent:</b> Thursday, January 30, 2020 3:53 PM<br>
<b>To:</b> gate-users@lists.opengatecollaboration.org<br>
<b>Subject:</b> Re: [Gate-users] GATE 7 metastable source definition<o:p></o:p></p>
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<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal" style="margin-bottom:12.0pt">Hi all, <br>
<br>
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.<br>
<br>
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.
<br>
<br>
Thank you! <br>
<br>
Chris<br>
<br>
/----------------------------------------------------------------------------------------------------------<o:p></o:p></p>
<pre>Hi,<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>you should take Mo-99, i.e. Z=42, A=99 instead, since Tc-99m<o:p></o:p></pre>
<pre>is part of the Mo-99 decay scheme. I have just tried it with<o:p></o:p></pre>
<pre>the Spectro-example of EduGATE and it gives a useful spectrum!<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Also, if you use the physicslist mechanism for the physical processes you need to add:<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>/gate/physics/addPhysicsList emstandard<o:p></o:p></pre>
<pre>/gate/physics/addProcess RadioactiveDecay<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Hope this is helpful for you!<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Kind regards,<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Uwe Pietrzyk<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>/----------------------------------------------------------------------<o:p></o:p></pre>
<pre>Prof. Dr. Uwe Pietrzyk<o:p></o:p></pre>
<pre>Diplom-Physiker<o:p></o:p></pre>
<pre>Institut für Neurowissenschaften und Medizin / INM-4<o:p></o:p></pre>
<pre>Forschungszentrum Jülich GmbH<o:p></o:p></pre>
<pre>52425 Jülich<o:p></o:p></pre>
<pre>Tel: +49-2461-61 4763<o:p></o:p></pre>
<pre>Fax: +49-2461-61 2820<o:p></o:p></pre>
<pre>Mobil: +49-162-103-4871<o:p></o:p></pre>
<pre>eMail: <a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">U.Pietrzyk at fz-juelich.de</a><mailto:<a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">U.Pietrzyk at fz-juelich.de</a>><o:p></o:p></pre>
<pre><a href="http://www.fz-juelich.de/inm/inm-4/DE/Home/home_node.html">http://www.fz-juelich.de/inm/inm-4/DE/Home/home_node.html</a><o:p></o:p></pre>
<pre>&<o:p></o:p></pre>
<pre>Bergische Universität Wuppertal<o:p></o:p></pre>
<pre>Fachbereich C - Physik / D.08.01<o:p></o:p></pre>
<pre>Gaußstr. 20<o:p></o:p></pre>
<pre>42097 Wuppertal<o:p></o:p></pre>
<pre>Tel: +49-(0)202-439-3523<o:p></o:p></pre>
<pre>Fax: +49-(0)202-439-2811<o:p></o:p></pre>
<pre>eMail: <a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">Uwe.Pietrzyk at physik.uni-wuppertal.de</a><mailto:<a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">Uwe.Pietrzyk at physik.uni-wuppertal.de</a>><o:p></o:p></pre>
<pre><a href="http://www.medizinphysik.uni-wuppertal.de%3chttp:/www.medizinphysik.uni-wuppertal.de/">http://www.medizinphysik.uni-wuppertal.de<http://www.medizinphysik.uni-wuppertal.de/</a>><o:p></o:p></pre>
<pre>----------------------------------------------------------------------/<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>On 30 Jan 2015, at 21:17, Xinchi Hou <<a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">monicaxinchi at gmail.com</a><mailto:<a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">monicaxinchi at gmail.com</a>>> wrote:<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>Dear Gate-users,<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>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:<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>/gate/source/SourceTC99m/gps/particle ion<o:p></o:p></pre>
<pre>/gate/source/SourceTC99m/gps/ion 43 99 0 142.6833<o:p></o:p></pre>
<pre>/gate/source/SourceTC99m/gps/monoenergy 0 keV<o:p></o:p></pre>
<pre>/gate/source/SourceTC99m/setForcedUnstableFlag true<o:p></o:p></pre>
<pre>/gate/source/SourceTC99m/setForcedHalfLife 21640 s<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>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.<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>I really appreciate if somebody could share his/her experience on similar problems.<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>My best regards,<o:p></o:p></pre>
<pre>Monica<o:p></o:p></pre>
<p class="xmsonormal"> <o:p></o:p></p>
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