In this study, we have studied the effects of temperature and X-ray energy\nvariations on the light output signals from two different fiber-optic sensors, a fiber-optic\ndosimeter (FOD) based on a BCF-12 as a plastic scintillating fiber (PSF) and a fiber-optic\nthermometer (FOT) using a silver halide optical fiber as an infrared optical fiber (IR fiber).\nDuring X-ray beam irradiation, the scintillating light and IR signals were measured\nsimultaneously using a dosimeter probe of the FOD and a thermometer probe of the FOT.\nThe probes were placed in a beaker with water on the center of a hotplate, under variation\nof the tube potential of a digital radiography system or the temperature of the water in the\nbeaker. From the experimental results, in the case of the PSF, the scintillator light output at\nthe given tube potential decreased as the temperature increased in the temperature range\nfrom 25 to 60 Ã?°C. We demonstrated that commonly used BCF-12 has a significant\ntemperature dependence of âË?â??0.263 Ã?± 0.028%/Ã?°C in the clinical temperature range. Next, in\nthe case of the IR fiber, the intensity of the IR signal was almost uniform at each temperature\nregardless of the tube potential range from 50 to 150 kVp. Therefore, we also demonstrated\nthat the X-ray beam with an energy range used in diagnostic radiology does not affect the\nIR signals transmitted via a silver halide optical fiber.
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