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    User name Stahl

    Log entry time 19:13:31 on October 7,2004

    Entry number 19

    keyword=CsI background installation

    I just reinstalled one of our two prototype detectors the so-called DESY-PMT.
    It is flat on the positron table, pointing upstream, 160mm north of the beamline.
    There is approx. 16" lead shielding at the front and the two sides, approx. 4" on top.
    No shielding at the backside and to the bottom.
    The intention is to use the detector to measure the ammount of radiation coming from below trhough the table.