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(a) In the FOS design, CsI is deposited on an FOP, which is in contact with the optical sensor. FOS designs feature an optically absorbing backing in HR type, and a reflective backing in HL type. (b) GPXS type samples feature CsI deposited on a reflective aluminum backing, and the sensor‐coupled surface is coated with a transparent protective film. Samples of FOS HR, FOS HL, and GPXS with 150 #bib200 #bib600, and 1000 μm thickness were studied.
