Hello Gaters! Is there anyone who has added the material BGO to the Materials.xml file? Just adding it to the GateMaterials.db database doesn't support optical photons travelling in the crystal. I found a previous thread "Materials.xml collaboration!" (<a href="http://lists.healthgrid.org/archives/gate-users/2008-January/002364.html" target="_blank">http://lists.healthgrid.org/archives/gate-users/2008-January/002364.html</a>) where you could download a file containing some information about other crystals. There are some posts missing regarding BGO however... Any ideas? Thanks, Ida