HI Carl, You might find Richard's measurements on 1 and 2mm2 SiPM measurements interesting and useful, if you have not seen it yet. You can find his report at http://zeus.phys.uconn.edu/halld/bltwghome/UConn-Jlab_contract-2006/report-2-2007.pdf Cheers, Elton. Elton Smith Jefferson Lab MS 12H5 12000 Jefferson Ave Suite # 16 Newport News, VA 23606 elton@jlab.org (757) 269-7625