<div class="gmail_quote"><div>Hi Johannes Try this Nal properties (attached). The original contribution can be found in the mailing list. For the Al, I don't have one I hope this helps you Best regards José Ramos Laboratorio de Física Médica. Facultad de Ciencias Físico Matemáticas. Benemérita Universidad Autónoma de Puebla, México e- + e+ -> <~~*~~> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hallo gate-users, I'm new in gate and at the moment working on a simulation, that considers optical photons due to my masterthesis. Does anybody has experience in simulating optical photons or know where I can find data to creat my propertyvectors (NaI, Al)? Best regards, Johannes Bender Dresden University of Technology, Germany (+49 176 6385 4629) </blockquote></div> -- e- + e+ -> <~~*~~>