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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif;">Hi,</span><br>
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<span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);"><br>
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<span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">You can define a multiple source the same way you define a single source.</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">Since you don't seem to know how to define a (hot and/or cold) source you can read this part of the documentation :</span></div>
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<a href="https://opengate.readthedocs.io/en/latest/source_and_particle_management.html"><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(12, 100, 192);">https://opengate.readthedocs.io/en/latest/source_and_particle_management.html</span></a><br>
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<span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">For example, </span></div>
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<span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);"># SOURCE 1</span><span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/addSource source1</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/setActivity 10 kBq</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/gps/particle e+</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/gps/energytype Fluor18</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/setForcedUnstableFlag true</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/setForcedHalfLife 6586.0 s</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/gps/type Volume</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/gps/shape Cylinder</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/gps/radius 0.5 mm</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/gps/halfz 10 mm</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/gps/angtype iso</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/gps/centre 0.0 0.0 0.0 mm</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/attachTo volume1</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source1/visualize 10 green 1</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);"># SOURCE 2
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/addSource source2</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/setActivity 10 kBq</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/gps/particle e+</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/gps/energytype Fluor18</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/setForcedUnstableFlag true</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/setForcedHalfLife 6586.0 s</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/gps/type Volume</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/gps/shape Cylinder</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/gps/radius 1.0 mm</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/gps/halfz 10 mm</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/gps/angtype iso</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/gps/centre 0.0 0.0 0.0 mm</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/attachTo volume2</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">/gate/source/source2/visualize 40 green 1</span><br>
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<div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);"># SOURCE N
</span><br>
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<span style="font-family: Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">...</span>
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<pre lang="plaintext"><div><br></div><span></span>Émilie</pre>
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