The paper presents a set of tests carried out in order to evaluate the design\ncharacteristics and the operating performance of a set of six X-ray extrinsic optical fiber\nsensors. The extrinsic sensor we developed is intended to be used as a low energy X-ray\ndetector for monitoring radiation levels in radiotherapy, industrial applications and\nfor personnel dosimetry. The reproducibility of the manufacturing process and the\ncharacteristics of the sensors were assessed. The sensors dynamic range, linearity,\nsensitivity, and reproducibility are evaluated through radioluminescence measurements,\nX-ray fluorescence and X-ray imaging investigations. Their response to the operating\nconditions of the excitation source was estimated. The effect of the sensors design and\nimplementation, on the collecting efficiency of the radioluminescence signal was\nmeasured. The study indicated that the sensors are efficient only in the first 5 mm of the\ntip, and that a reflective coating can improve their response. Additional tests were done to\ninvestigate the concentricity of the sensors tip against the core of the optical fiber guiding\nthe optical signal. The influence of the active material concentration on the sensor response\nto X-ray was studied. The tests were carried out by measuring the radioluminescence signal\nwith an optical fiber spectrometer and with a Multi-Pixel Photon Counter.
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