<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:18px"><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2730" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;">Dear all,</div><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2730" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;"><br id="yui_3_16_0_1_1440087933563_5509" class=""></div><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2734" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;">I am trying to simulate a CT scanner. For source definition, I need to use arbitrary point-wise spectrum "Arb" as following command:</div><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2734" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;"><br id="yui_3_16_0_1_1440087933563_5513" class=""></div><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2738" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;">/gate/source/xraygun/gps/histpoint energy (MeV) ????</div><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2738" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;"><br id="yui_3_16_0_1_1440087933563_5517" class=""></div><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2742" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;">Please guide me what is the second column in the command? Photon fluence (photon/mm2.s)? or photon flux (photon/s)? or number of photons in source?</div><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2742" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;"><br id="yui_3_16_0_1_1440087933563_5521" class=""></div><div class="" id="yiv6374552518yui_3_16_0_1_1439882981528_2746" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;">Best Regards,</div><div id="yiv6374552518yui_3_16_0_1_1439882981528_2722" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;" class=""></div><div class="" dir="ltr" id="yiv6374552518yui_3_16_0_1_1439882981528_2750" style="font-family: 'bookman old style', 'new york', times, serif; font-size: 16px;">Masoud</div></div></body></html>