<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Hello ,<br><br>I am currently trying to simulate a beam of protons in a cube of water, so I'm using the <strong>QGSP_BIC_HP</strong> physics list.<br>But I also want to take into account the radioactive decay of the LSO crystals of my detector, so I'm also using the <strong>radioactive decay</strong> process.<br>They both work if I'm using them one by one, but once I'm using them both at the same time, the radioactive decay doesn't work anymore.<br>In the log file of my simulation, it is written that the radioactive process is "enabled" but not "initialized", whereas I'm initializing both of them, as in the following:<br></div><div><br data-mce-bogus="1"></div><div><em>/gate/physics/addPhysicsList QGSP_BIC_HP_PEN # Proton's physics</em><br><br><em>/gate/physics/addProcess RadioactiveDecay # Radioactive Decay.</em><br><br><em>/gate/physics/processList Enabled</em><br><em>/gate/physics/processList Initialized</em><br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>I figured that there might be a conflict with two processes so I look at what exactly were in <strong>QGSP_BIC_HP</strong> and tried to remove the processes one by one to see which one was interfering with the radioactive decay.<br data-mce-bogus="1"></div><div>It worked when I removed ionization of protons, anti_protons, ions and alphas. I didn't try to remove them one by one but it worked when I took off all 4. The problem is that those processes are very important for my simulation, so I don't really know what to do!<br data-mce-bogus="1"></div><div>I could do 2 different simulations but I actually want to see if there's a difference when I do it all in one compared to when I do 2 different and I sum them.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Thanks for your contribution!<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Nicolas Fisichella<br data-mce-bogus="1"></div></div></body></html>