| http://www.w3.org/ns/prov#value | - An imaging lens 26 is placed close to the rotating tube to collect a fraction of the resulting fluorescence emission and to image the emission onto a detector such as a photo-multiplier tube 28 so as to produce a detected fluorescent signal I. Although other types of detectors such as solid-state photovoltic detectors may be employed, a photo-multiplier tube would typically be used for the most se
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