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    User name R. Michaels

    Log entry time 08:33:04 on June20,2004

    Entry number 126403

    This entry is a followup to: 126372

    keyword=Alum. background (more)

    Refer also to
    halog 126314

    Two people have told me the dummy is 1 mm thick (both front and back).
    Since it seems the front/back acceptance is about the same, the
    "xt" factor is 0.25. Bottom line is the background from Alum is:

    2.3   +/-   0.5 %

    This is pretty close to the proposal estimate (3.3 %).
    Right now I don't think we need to measure the asymmetry of Alum
    since its mostly Q.E. and even if we know it to only 100% it
    should be a small error. Is this ok ?