<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">Hi Christopher<div><br></div><div>I am using GATE 8.1, and yes, this is the Ion source configuration and add<b> /gate/physics/addProcess RadioactiveDecay</b></div><div><b>BUT:</b></div><div>I used to use a spectra definition to create the source, and I used the spectra form the ICRP 107</div><div><a href="https://journals.sagepub.com/doi/suppl/10.1177/ANIB_38_3">https://journals.sagepub.com/doi/suppl/10.1177/ANIB_38_3</a><br></div><div><br></div><div>In the last weeks I have been testing the Ion source definition and compared with the spectra definition, there are three things:</div><div>1- Spectra definition is faster that Ion definition.</div><div>2- Spectra definition showed a better agreement with previous studies:</div><div><a href="http://iopscience.iop.org/article/10.1088/0031-9155/57/2/517/meta">http://iopscience.iop.org/article/10.1088/0031-9155/57/2/517/meta</a><br></div><div><a href="https://www.ncbi.nlm.nih.gov/pubmed/23927347">https://www.ncbi.nlm.nih.gov/pubmed/23927347</a><br></div><div>3- Spectra definition required to multiply for the total emission probabilities of the radionuclide, there is an example in the GATE example folder.</div><div><br></div><div>I recomend you to compare your source with other simulation for example:</div><div><a href="http://www.medphys.it/down_svoxel.htm">http://www.medphys.it/down_svoxel.htm</a><br></div><div>And OLINDA sphere model if you have access to olinda.</div><div><br></div><div>An a last thing, if you use the dose actor, there is something pretty weird that I don´t know the reason, I already dive in the GATE code but I did not find the source, but to have the right S-value it is necessary to normalize to 1E9 particles or simulate 1E9 particles.</div><div><br></div><div>If you start to work on this, it would be nice to know your results. In mi case I am simulating a Lu-177 source in a 1mm3 voxel and in the first to voxel the error with the Ion definition is below 3% but after that all the values are -20% or around comparing my data with:</div><div><a href="https://www.ncbi.nlm.nih.gov/pubmed/23927347">https://www.ncbi.nlm.nih.gov/pubmed/23927347</a></div><div>And using spectra definition and emOpt3 I have these values in the voxel kernel</div><div>Position Error%</div><div>0mm
1.048</div><div>1mm -0.856</div><div>2mm -10.755</div><div>3mm 2.045</div><div>4mm 2.978</div><div>5mm 4.137</div><div>6mm 2.759</div><div>...</div><div><br></div><div>Best regards</div><div>Maikol</div><div><br></div></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr">El vie., 16 nov. 2018 a las 16:34, Christopher Watanabe (<<a href="mailto:chris.r.watanabe@gmail.com">chris.r.watanabe@gmail.com</a>>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Hello fellow GATE users, <br><br></div>I am trying to simulate a Rhenium 188 source, with a half life of 17 h, two modes of beta decay @ 2120keV (71.1%) and 1956 (25.6%). There is also a corresponding gamma decay of 155keV (15%). <br><br></div><div>My question is: how do I simulate this? I've found many different answers in the forums, including defining it as an ion as follows: <br></div><div><br></div><div><div><img src="cid:ii_jok6ljni1" alt="image.png" width="391" height="108"><br><br></div><div>However, running this in a simulation yielded nothing in the dose distribution, so I have a feeling it's not emitting as I expect. <br></div><div><br></div><div>I've also found in the forums that one must explicitly add RadioactiveDecay to the physics processes. This I have done, but I wonder if this is necessary in GATE V_8.0. Otherwise, I am also running geant4.10.3.1. <br><br></div><div>Much appreciated! Please let me know if there are any questions I can answer. <br></div></div><br><br></div>
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