| http://www.w3.org/ns/prov#value | - A photodetector 532 is optically coupled to the proximal end 534 of optical 524 Photodetector 532 may be a photodiode, a photomultiplier tube, a phototransistor, a charge-coupled device, or other device which transduces the light signal generated at x-ray marker 526 due to exposure to an x-ray flux into an electrical signal when the light signal is transmitted down optical fiber 524 to photodetect
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