Matt, To see the rate of radiation damage of this particular lead glass in a tagged photon beam, see the recent Radphi detector article in Nuclear Instruments and Methods in Physics Research A 570 (2007) 384. For more details, you can speak with me or Mihajlo. The Radphi beam intensity turns out to be the same as GlueX high intensity running (10^8 in the tagged peak) within a factor 2 or so. The endpoint is irrelevant because most of the flux is at low energy. I can dig up the exact normalization number if you need it. Richard J.
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