<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:18px"><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2571" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2572"><font id="yiv3323492566yui_3_16_0_1_1440163747711_2754" face="times new roman, new york, times, serif" class="">Dear all,</font></span></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2569" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font face="times new roman, new york, times, serif" id="yui_3_16_0_1_1440410174283_6137" class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2570">In </span>arbitrary point-wise spectrum "Arb" comment for definition of an x-ray spectrum using GATE, the first column is Energy (MeV) and the second one, if we use the number of photons in each energy is for example:</font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2569" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font face="times new roman, new york, times, serif" class=""><br class=""></font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2553" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font face="times new roman, new york, times, serif" id="yiv3323492566yui_3_16_0_1_1440163747711_2796" class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2568" style="font-size: 10pt; line-height: 15.3333330154419px;">/gate/source/xraygun/gps/histpoint 0.1 50</span><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2552" style="font-size: 10pt; line-height: 15.3333330154419px;"><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2567">/gate/source/xraygun/gps/histpoint 0.2 60</span><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2566">/gate/source/xraygun/gps/histpoint 0.3 70</span><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2565">/gate/source/xraygun/gps/histpoint 0.4 80</span><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2564">/gate/source/xraygun/gps/histpoint 0.5 90</span><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2551">/gate/source/xraygun/gps/histpoint 0.6 100</span><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2554">/gate/source/xraygun/gps/histpoint 0.7 90</span><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2555">/gate/source/xraygun/gps/histpoint 0.8 80</span><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2556">/gate/source/xraygun/gps/histpoint 0.9 70</span><br class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2557">/gate/source/xraygun/gps/histpoint 1.0 60</span></span></font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2553" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font face="times new roman, new york, times, serif" class=""><span class="" style="font-size: 10pt; line-height: 15.3333330154419px;"><span class=""><br class=""></span></span></font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2558" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font face="times new roman, new york, times, serif" id="yiv3323492566yui_3_16_0_1_1440163747711_2795" class="">As you can see the total number of photons in the spectrum is equal 850. So please guide me if I need to set activity in the following comment as 850 Bq? And what about time slice?</font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2558" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font face="times new roman, new york, times, serif" class=""><br class=""></font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2560" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; margin-bottom: 0.0001pt;"><font id="yiv3323492566yui_3_16_0_1_1440163747711_2761" face="times new roman, new york, times, serif" class=""><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2559" style="font-size: 10pt; line-height: 15.3333330154419px;">/gate/source/x-raygun/setActivity </span><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2790" style="font-size: 10pt; line-height: 15.3333330154419px; background: yellow;">850 Becquerel</span><span class="" style="font-size: 10pt; line-height: 15.3333330154419px;"></span></font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2561" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><span class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2562" style="font-size: 10pt; line-height: 15.3333330154419px;"><font id="yiv3323492566yui_3_16_0_1_1440163747711_2757" face="times new roman, new york, times, serif" class="">/gate/application/setTimeSlice 1. S</font></span></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2561" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><span class="" style="font-size: 10pt; line-height: 15.3333330154419px;"><font face="times new roman, new york, times, serif" class=""><br class=""></font></span></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2563" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font id="yiv3323492566yui_3_16_0_1_1440163747711_2758" face="times new roman, new york, times, serif" class="">If I use the normalized value for the second column, what can I set activity? I have just 850 photons not more! Thank you.</font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2563" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font face="times new roman, new york, times, serif" class=""><br class=""></font></div><div class="" id="yiv3323492566yui_3_16_0_1_1440163747711_2759" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font face="times new roman, new york, times, serif" id="yiv3323492566yui_3_16_0_1_1440163747711_2807" class="">Best Regards,</font></div><div id="yiv3323492566yui_3_16_0_1_1440163747711_2477" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;" class=""></div><div class="" dir="ltr" id="yiv3323492566yui_3_16_0_1_1440163747711_2574" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><font id="yiv3323492566yui_3_16_0_1_1440163747711_2756" face="times new roman, new york, times, serif" class="">Masoud</font></div></div></body></html>