NASA's Chandra X-ray Observatory includes a Flight Contamination Monitor (FCM), a system of 16 radioactive calibration sources mounted to the inside of the Observatory's forward contamination cover. The purpose of the FCM is to verify the ground-to-orbit transfer of the Chandra flux scale, through comparison of data acquired during the ground calibration with those obtained in orbit, immediately prior to opening the Observatory's sun-shade door. Here we report results of these measurements, which place limits on the change in mirror-detector system response and, hence, on any accumulation of molecular contamination on the mirrors' iridium-coated surfaces.


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    Title :

    Measurements with the Chandra Flight Contamination Monitor


    Contributors:

    Publication date :

    2000-01-01


    Type of media :

    Preprint


    Type of material :

    No indication


    Language :

    English


    Keywords :


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