Radioluminescence sensing of radiology exposures using P-doped silica optical fibres. (November 2018)

• Record Type: Journal Article
• Authors: Bradley, D.A.; Zubair, H.T.; Oresegun, A.; Louay, G.T.; Ariffin, Alawiah; Khandaker, Mayeen Uddin; Alzimami, Khalid S.; Abdul-Rashid, H.A.
• Is Part Of: Applied radiation and isotopes. Volume 141(2018:Nov.)
• Page Start: 176
• Page End: 181
• Publication Date: 2018-11
• Subjects: Radioluminescence dosimetry -- P-doped silica -- Fast-timing -- Diagnostic radiology; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2018.02.025
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: In previous work we investigated the real-time radioluminescence (RL) yield of Ge-doped silica fibres and Al2 O3 nanodot media, sensing electron- and x-ray energies and intensities at values familiarly obtained in external beam radiotherapy. The observation of an appreciable low-dose sensitivity has given rise to the realisation that there is strong potential for use of RL dosimetry in diagnostic radiology. Herein use has been made of P-doped silica optical fibre, 2 mm diameter, also including a 271 µm cylindrical doped core. With developing needs for versatile x-ray imaging dosimetry, preliminary investigations have been made covering the range of diagnostic x-ray tube potentials 30 kVp to 120 kVp, demonstrating linearity of RL with kVp as well as in terms of the current-time (mAs) product. RL yields also accord with the inverse-square law. Given typical radiographic-examination exposure durations from tens- to a few hundred milliseconds, particular value is found in the ability to record the influence of x-ray generator performance on the growth and decay of beam intensity, from initiation to termination. Highlights: First use is made of radioluminescence (RL) from P-doped silica fibre in tracking the energising of a diagnostic x-ray tube. Real-time, sensitive detection at sub millisecond temporal resolution obtained. RL from this small volume sensor has demonstrable potential for use in patient dosimetry and generator performance analysis.