Feasibility of miniature radiation portal monitor for measurement of radioactivity contamination in flowing water in pipe

Kim, J.; Park, K.; Joo, Koan Sik

doi:10.1088/1748-0221/13/01/p01022

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…The fit, shown in figure 9, confirms the linearity of the relationship between the gamma-ray energy and peak channel number for energies ranging from 122 to 1332 keV. R-squared is the root mean square value and is commonly used for analyzing the difference between a theoretical value and the measured value [9]. The R-squared value corresponding to this linear fit is found to be 0.99937.…”

Section: Resultssupporting

confidence: 56%

Feasibility of underwater radiation detector using a silicon photomultiplier (SiPM)

Kim

Joo

2020

J. Inst.

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In this paper, the development of an underwater radiation detector is presented using a silicon photomultiplier (SiPM), CsI(Tl) scintillator, and light guide. The detector characteristics were evaluated. The detector has good energy resolution characteristics in which the gammaray emission energy 122 keV of 57 Co had an energy resolution of 18.12%, 356 keV of the 133 Ba spectrum had 10.91%, 662 keV of the 137 Cs spectrum had 8.84%, and 1332 keV of the of the 60 Co spectrum had 4.55%. Further, in the case of mixed sources, the gamma radiation peaks were readily distinguishable, and the R-squared value in the gamma-ray energy of 122-1332 keV for energy linearity was calculated to be 0.99937, demonstrating an exceptional energy linearity. In addition, radiative contaminated water was prepared as a liquid radiation source and characterized. The measurement results showed 0.61 ±0.0046 cps in the background and 0.74 ±0.0070 cps at the minimum concentration of 38.71 Bq/L. The R-squared value for concentrations in the range of 38.71-4955 Bq/L, which indicates the linearity of a detector based on the signal intensity, was determined to be 0.99710, indicating a good linear responsivity. The characterization results suggest that the radiation detectors based on SiPM-and CsI(Tl) can replace the currently used PMT-based radiation detector in an underwater environment. K: Detector design and construction technologies and materials; Dosimetry concepts and apparatus; Scintillators and scintillating fibres and light guides 1Corresponding author.

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Section: Resultssupporting

confidence: 56%

Feasibility of underwater radiation detector using a silicon photomultiplier (SiPM)

Kim

Joo

2020

J. Inst.

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“…The root mean square is commonly used when dealing with the difference between the estimated or model-predicted value and the observed value in a real environment. Thus, it is suitable for indicating the precision [8].…”

Section: Resultsmentioning

confidence: 99%

Development of compact and real-time radiation detector based on SiPM for gamma-ray spectroscopy

Kim¹,

Park²,

Joo³

2018

J. Inst.

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In this research, a radiation detector based on a silicon photomultiplier (SiPM) and Ce doped Gd 3 Al 2 Ga 3 O 12 (GAGG(Ce)) scintillator was developed for nuclide analysis, and the spectroscopic characteristics were compared with those of an optical-fiber-based radiation detector. The results showed that the developed detector was 1.64-3.86 times more efficient for detection compared to the optical-fiber-based detector, and the R-squared value of the linearity of the developed detector was 0.99760 according to the radiation intensity, demonstrating the best linearity. The optical-fiberbased detector had a poor resolution characteristic with respect to the gamma-ray emission energy, whereas the developed SiPM-based detector had a high resolution of 17.2% at 122 keV (the gammaray emission energy of 57 Co), 13.5% at 356 keV (the gamma-ray emission energy of 133 Ba), 6.9% at 511 keV (the gamma-ray emission energy of 22 Na), and 5.8% at 662 keV (the gamma-ray emission energy of 137 Cs). Furthermore, it was confirmed that the R-squared value in the gamma-ray energy range of 122-662 keV was 0.99860, indicating good linearity. Therefore, the PMT-based radiation detectors used in narrow environments subject to electromagnetic fields can be replaced with the SiPM-based radiation detector by applying the results of this study to miniaturized signal processors. K: Dosimetry concepts and apparatus; Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators) 1Corresponding author.

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“…This limitation, attributed to the long response time of CsI (Tl) crystals (0.6–3.4 µs), has lead to consideration of use of a Ce-doped alternative to give a higher dynamic range. In a similar attempt, Kim et al 9 monitored radioactive contamination in flowing water pipes, use being made of a Ce-doped GAG (Gd 3 Al 2 Ga 3 O 12 ) scintillator, the fixed setup placed externally to the pipe forming a radiation gauge. The study highlighted the effectiveness of the Ce-doped scintillator in measuring radiation levels from a variety of gamma source emissions: 122 keV from a Co-57 source; 662 keV from a Cs-137 source; and 1173 keV and 1332 keV from a Co-60 source.…”

Section: Review Of Previous Workmentioning

confidence: 99%

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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Feasibility of miniature radiation portal monitor for measurement of radioactivity contamination in flowing water in pipe

Cited by 7 publications

References 8 publications

Feasibility of underwater radiation detector using a silicon photomultiplier (SiPM)

Feasibility of underwater radiation detector using a silicon photomultiplier (SiPM)

Development of compact and real-time radiation detector based on SiPM for gamma-ray spectroscopy

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

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