Fiber optic coupled survey meter for NORM and low-level radioactivity monitoring

Zubair, H.T.; Rifiat, R.; Oresegun, Adebiyi; Hamidi, F.; Othman, J.; Khairina, M.D.; Basaif, A.; Ibrahim, Siti Azlida; Abdul-Rashid, H.A.; Bradley, D.A.

doi:10.1016/j.radphyschem.2021.109682

Cited by 2 publications

(7 citation statements)

References 12 publications

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“…The mean dose-rates at distances of 12, 10, 8, 5, 3, 1, and 0.2-cm were found to be 1.19, 1.47, 1.98, 2.72, 4.37, 6.44, and 7.59 µSv/h, respectively. As observed in several previous studies 1 , 7 , at extremely low radiation levels, discrimination between different dose rates requires longer integration time, in the range of tens of seconds. Results for the present arrangement shows effective discrimination at the level of ~ 0.5 µSv/h for data acquired over a period of 30–40 s. A more elaborate discussion regarding responses at low dose rates will be presented in a subsequent subsection.…”

Section: Resultssupporting

confidence: 53%

“…Readout is provided by a unit powered by a rechargeable low voltage battery, and can make measurements at relatively long distance, even in narrow and difficult environments. This new device outperforms previous, benchtop versions 1 in terms of size and radiation detection capability.…”

Section: Introductionmentioning

confidence: 84%

“…Signal loss along the fibre channel was minimised by using an optical channel instead of traditional copper wire (extending from the silicon photomultiplier) and by selecting an appropriate large core specialty optical fibre made of plastic (instead of the usual glass) to provide flexibility over long distances. Larger core optical fibre having 2 mm diameter opposed to 1 mm core diameter as in Zubair et al 1 contributes significantly to light capture and sensitivity improvements; Sensitivity due to small size: The sensitivity of the miniature probe (3 mm diameter, compared to 25 mm diameter in conventional systems) was maximised by applying a titanium oxide reflective paint coating and designing 3D printed structures to support fibre-to-SiPM coupling. The desire for a handheld instrument: Signal Processing circuits require high power, typically supplied by the mains: To circumvent this, a signal processing circuit with low-power components was designed.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…In the present system, the radioluminescence (RL) produced by the scintillators propagates within the optical fibre waveguide to a photo-detection system, providing real-time, remote, and intrinsically safe radiation measurements capability. As has been investigated 1 , the particular LYSO:Ce scintillator arrangement provides a workable sensitivity, which although clearly leading to lesser values than that of GM systems, does offer considerable versatility in the practical applications for which it is intended. In particular, LYSO:Ce provides for high density (7.15 g/cm 3 ) and high light output (70% of NaI(Tl), 25 photons/keV), leading to improved sensitivity.…”

Section: Review Of Previous Workmentioning

confidence: 99%

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An extendable optical fibre probe survey meter for naturally occurring radioactive material (NORM) and other weak emitters

Zubair,

Bradley,

Khairina

et al. 2023

Sci Rep

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We have developed a radioluminescence-based survey meter for use in industries in which there is involvement in naturally occurring radioactive material (NORM), also in support of those needing to detect other weak emitters of radiation. The functionality of the system confronts particular shortcomings of the handheld survey meters that are currently being made use of. The device couples a LYSO:Ce scintillator with a photodetector via a polymer optical fibre waveguide, allowing for "intrinsically safe" inspection within pipework, separators, valves and other such component pieces. The small-diameter optical fibre probe is electrically passive, immune to electromagnetic interference, and chemically inert. The readout circuit is entirely incorporated within a handheld casing housing a silicon photomultiplier (SiPM) detection circuit and a microprocessor circuit connected to an LCD display. A 15 m long flexible PMMA optical fibre waveguide is butt coupled to an ABS plastic probe that retains the LYSO:Ce scintillator. Initial tests have included the use of lab-based mixed gamma-ray sources, measurements being made in concert with a reference conventional GM survey-meter. Characterization, via NORM sources at a decontamination facility, has shown useful sensitivity, covering the dose-rate range 0.10- to 28 µSv h−1 (R-squared 0.966), extending to 80 µSv/h as demonstrated in use of a Cs-137 source. The system is shown to provide an effective tool for detection of radioactivity within hard to access locations, in particular for sources emitting at low radiation levels, down to values that approach background.

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Section: Resultssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Review Of Previous Workmentioning

confidence: 99%

See 3 more Smart Citations

An extendable optical fibre probe survey meter for naturally occurring radioactive material (NORM) and other weak emitters

Zubair,

Bradley,

Khairina

et al. 2023

Sci Rep

Self Cite

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Recent Advances in Optical Fiber Enabled Radiation Sensors

Zhang

Xiang

Wang

et al. 2022

Sensors

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Optical fibers are being widely utilized as radiation sensors and dosimeters. Benefiting from the rapidly growing optical fiber manufacturing and material engineering, advanced optical fibers have evolved significantly by using functional structures and materials, promoting their detection accuracy and usage scenarios as radiation sensors. This paper summarizes the current development of optical fiber-based radiation sensors. The sensing principles of both extrinsic and intrinsic optical fiber radiation sensors, including radiation-induced attenuation (RIA), radiation-induced luminescence (RIL), and fiber grating wavelength shifting (RI-GWS), were analyzed. The relevant advanced fiber materials and structures, including silica glass, doped silica glasses, polymers, fluorescent and scintillator materials, were also categorized and summarized based on their characteristics. The fabrication methods of intrinsic all-fiber radiation sensors were introduced, as well. Moreover, the applicable scenarios from medical dosimetry to industrial environmental monitoring were discussed. In the end, both challenges and perspectives of fiber-based radiation sensors and fiber-shaped radiation dosimeters were presented.

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Fiber optic coupled survey meter for NORM and low-level radioactivity monitoring

Cited by 2 publications

References 12 publications

An extendable optical fibre probe survey meter for naturally occurring radioactive material (NORM) and other weak emitters

An extendable optical fibre probe survey meter for naturally occurring radioactive material (NORM) and other weak emitters

Recent Advances in Optical Fiber Enabled Radiation Sensors

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