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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Dear GATE experts,
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">I am trying to score the fluence of secondary neutrons in a proton therapy plan and I am using the following code to do so (using the QGSP_BIC_HP physics list):
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/addActor EnergySpectrumActor espect<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/attachTo patient<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/addFilter particleFilter<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/particleFilter/addParticle neutron<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/energySpectrum/setEmin 0.001 eV<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/energySpectrum/setEmax 250 MeV<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/energySpectrum/setNumberOfBins 500<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:#666666">/</span><span style="font-size:12.0pt;color:black">gate</span><span style="font-size:12.0pt;color:#666666">/</span><span style="font-size:12.0pt;color:black">actor</span><span style="font-size:12.0pt;color:#666666">/</span><span style="font-size:12.0pt;color:black">espect</span><span style="font-size:12.0pt;color:#666666">/</span><span style="font-size:12.0pt;color:black">setLogBinWidth
true</span><span lang="EN-US" style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/enableNbPartSpectrum true<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/saveAsText true<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">/gate/actor/espect/save output/espectrum.root<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">In the output file, the minimum energy of the spectrum is however 1 eV (10-^6 MeV) and I was wondering if there is a way to score thermal neutrons of energies down to around 0.02 eV. My suspicion
is that I need to adjust the physics list or threshold parameters – is anyone able to help me with this?
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Thank you in advance!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Kind regards, <o:p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Daniela Botnariuc
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