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Sensors 2014, 14(2), 3445-3457; doi:10.3390/s140203445

Characterization of Scintillating X-ray Optical Fiber Sensors

1,* , 1
1 National Institute Laser, Plasma and Radiation Physics, 409 Atomiştilor St., Măgurele RO-077125, Romania 2 Horia Hulubei" National Institute of Physics and Nuclear Engineering, 30 Reactorului St., Măgurele RO-077125, Romania 3 Optical Fibre Sensors Research Centre, ECE Department, University of Limerick, Limerick, Ireland
* Author to whom correspondence should be addressed.
Received: 31 December 2013 / Revised: 8 February 2014 / Accepted: 11 February 2014 / Published: 19 February 2014
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The paper presents a set of tests carried out in order to evaluate the design characteristics and the operating performance of a set of six X-ray extrinsic optical fiber sensors. The extrinsic sensor we developed is intended to be used as a low energy X-ray detector for monitoring radiation levels in radiotherapy, industrial applications and for personnel dosimetry. The reproducibility of the manufacturing process and the characteristics of the sensors were assessed. The sensors dynamic range, linearity, sensitivity, and reproducibility are evaluated through radioluminescence measurements, X-ray fluorescence and X-ray imaging investigations. Their response to the operating conditions of the excitation source was estimated. The effect of the sensors design and implementation, on the collecting efficiency of the radioluminescence signal was measured. The study indicated that the sensors are efficient only in the first 5 mm of the tip, and that a reflective coating can improve their response. Additional tests were done to investigate the concentricity of the sensors tip against the core of the optical fiber guiding the optical signal. The influence of the active material concentration on the sensor response to X-ray was studied. The tests were carried out by measuring the radioluminescence signal with an optical fiber spectrometer and with a Multi-Pixel Photon Counter.
Keywords: fiber optic sensor; radiation monitoring in radiotherapy and industry; personnel dosimetry; radioluminescence; X-ray detector; X-ray fluorescence; X-ray tomography fiber optic sensor; radiation monitoring in radiotherapy and industry; personnel dosimetry; radioluminescence; X-ray detector; X-ray fluorescence; X-ray tomography
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Sporea, D.; Mihai, L.; Vâţă, I.; McCarthy, D.; O'Keeffe, S.; Lewis, E. Characterization of Scintillating X-ray Optical Fiber Sensors. Sensors 2014, 14, 3445-3457.

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