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Hi Jared,
<div><br>
</div>
<div>let me briefly ask what the detector looked like?</div>
<div>Since there are emission lines of 202 and 88 keV, the 290 keV</div>
<div>is likely to be a "summation peak”.</div>
<div><br>
</div>
<div>I have checked the RadioactiveDecay in 7.1 for our EduGATE</div>
<div>examples and did not find anything wrong. So I am a little bit</div>
<div>puzzled by the statements in your eMail.</div>
<div><br>
</div>
<div>Kind regards,</div>
<div><br>
</div>
<div>Uwe Pietrzyk</div>
<div><br>
<div>
<div><span style="orphans: 2; widows: 2;">/----------------------------------------------------------------------</span></div>
<div style="orphans: 2; widows: 2;">Prof. Dr. Uwe Pietrzyk<br>
Diplom-Physiker<br>
Institut für Neurowissenschaften und Medizin / INM-4<br>
Forschungszentrum Jülich GmbH<br>
52425 Jülich<br>
Tel: +49-2461-61 4763<br>
Fax: +49-2461-61 2820<br>
Mobil: +49-162-103-4871<br>
eMail: <a href="mailto:U.Pietrzyk@fz-juelich.de">U.Pietrzyk@fz-juelich.de</a><br>
<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><br>
&<br>
Bergische Universität Wuppertal<br>
Fachbereich C - Physik / D.08.01<br>
Gaußstr. 20<br>
42097 Wuppertal<br>
Tel: +49-(0)202-439-3523<br>
Fax: +49-(0)202-439-2811<br>
eMail: <a href="mailto:Uwe.Pietrzyk@physik.uni-wuppertal.de">Uwe.Pietrzyk@physik.uni-wuppertal.de</a><br>
<a href="http://www.medizinphysik.uni-wuppertal.de/">http://www.medizinphysik.uni-wuppertal.de</a><br>
----------------------------------------------------------------------/</div>
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<div>On 15 Sep 2015, at 11:05, Jared Strydhorst <<a href="mailto:jared.strydhorst@gmail.com">jared.strydhorst@gmail.com</a>> wrote:</div>
<br class="Apple-interchange-newline">
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<div>
<div>If you're using RadioactiveDecay with GATE 7.1, there is a bug in Geant4 v10.1.1 that causes the emissions from the nuclear de-excitation to be simulated incorrectly. For example, I've found that after Lu-176 decays to Hf-176, it emits a 307 keV gamma,
correctly, but then goes to the ground state by emitting an unphysical 290 keV gamma, instead of a 202 keV followed by a 88 keV gamma, or the competing conversion electrons. I don't know how other isotopes are affected, though it seems from the relevant Geant4
forum that the problem isn't specific to Hf de-excitation.<br>
<br>
</div>
The bug has been fixed in G4 v10.2 (still in beta), and doesn't seem to be present in earlier versions, so if you use GATE 7.0 or earlier it shouldn't affect you.<br>
<br>
</div>
<span style="font-size:10pt" dir="ltr"><font size="1"><span style="font-size:13px"><font size="2"><span style="font-size:10pt">Jared STRYDHORST<br>
<br>
<div style="margin:0px"><span lang="fr"><font face="Cambria,serif">Laboratoire Imagerie Moléculaire In Vivo (IMIV)</font><font face="Cambria,serif"><br>
UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS</font></span></div>
<div style="margin:0px"><span lang="fr"><font face="Cambria,serif">CEA/I2BM/Service Hospitalier Frédéric Joliot</font></span></div>
<div style="margin:0px"><span lang="fr"><font face="Cambria,serif">4, place du Général Leclerc</font><font face="Cambria,serif"><br>
91401 ORSAY Cedex</font><font face="Cambria,serif"><br>
</font></span></div>
</span></font></span></font></span></div>
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