Determination of minimum detectable activity for underwater radiation detection system

Park, J. G.; Jung, Sung‐Hee; Moon, Jeonggeun; Kim, J.; Oh, Dae Min; Kang, Sung Won; Kim, Y.

doi:10.1088/1748-0221/14/10/p10038

Cited by 4 publications

(6 citation statements)

References 12 publications

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“…To the best of our knowledge, no study has continuously measured the radioactivity of radioactive wastewater decay tanks, and the continuous detection system proposed in this article is similar to underwater radiation monitoring systems that measure radioactivity in seawater or groundwater using NaI(Tl), LaBr 3 :Ce, Ce:GAGG, or CeBr 3 detectors [8][9][10][11][12][13][14] and in lakes using NaI(Tl) detectors [15][16][17][18]. A scintillation detector capable of examining radionuclides by analyzing the gamma radiation energy was used in all these studies.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the measurement error value increases, and the reliability of the measurement data decreases. Thus, it is necessary to increase the measurement time [16]. Fortunately, because radioactive wastewater in a decay tank is stored for weeks or months to reduce radioactivity owing to the decay of radionuclides, there is no practical limitation on the measurement time when a detector is installed on top of the tank.…”

Section: Methodsmentioning

confidence: 99%

“…Because the ACF is determined using the intrinsic characteristics of the scintillation detector and MCA, it cannot be obtained only by simulation; therefore, it must be obtained only experimentally or calculated by experiments and simulations [15]. Different departments use different isotopes in hospitals.…”

Section: Monte Carlo Simulationmentioning

confidence: 99%

“…Because water is a good shielding material, its efficiency varies according to the measurement radius [15]. Thus, by changing the radius (R) and height (H) of the water tank, as shown in Table 1, the change in ACF was calculated by the MCNP 6.2 (Los Alamos, NM, USA) with the Monte Carlo code using the F8 tally with the GEB option [22].…”

Section: Monte Carlo Simulationmentioning

confidence: 99%

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Design of a Low-Resolution Gamma-ray Spectrometer for Monitoring Radioactive Levels of Wastewater

Kim

Kim²,

Yang³

2022

Applied Sciences

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Wastewater containing radioactive materials is stored in decay tanks, which are typically installed in basements to restrict public access. Specific activity is measured by a gamma spectroscopy system or a gamma counter for several hours per sample before discharge. To simplify the sample collection and measurement procedures before draining, the specific activity conversion coefficient for converting a measured value from a 1.5″ NaI (Tl) detector installed on a tank into specific activity was calculated. The experimental calibration was performed in a test water tank with a volume of 14 L filled with diluted reference source 18F, which is most commonly used in hospitals. The specific activity of the test water was measured with a gamma spectroscopy system using a high-purity germanium detector calibrated with certified reference materials. The change in the conversion coefficient according to the change in the volume of the water tank was corrected based on a Monte Carlo calculation. Finally, it was determined whether the minimum detectable activity (MDA) of this system was lower than that of the draining standard. The counts for the specific activity conversion factor and MDA were evaluated as 5.5389 × 1010 and 2.09 × 105 for 18F and for the one-hour count, respectively. The MDA was lower than the standard value. Thus, this system can be used for discharge determination.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Monte Carlo Simulationmentioning

confidence: 99%

Section: Monte Carlo Simulationmentioning

confidence: 99%

See 2 more Smart Citations

Design of a Low-Resolution Gamma-ray Spectrometer for Monitoring Radioactive Levels of Wastewater

Kim

Kim²,

Yang³

2022

Applied Sciences

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“…To minimize the light loss occurring when bonding, we used optical grease (BC-630 model, manufactured by Saint-Gobain), which has a refractive index of 1.465 and optical transmittance of 95% in the spectral range of 280-700 nm [10]. The light guide surface was wrapped with Teflon tape.…”

Section: Methodsmentioning

confidence: 99%

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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Minimum detectable activity concentration of radio-cesium by a LaBr3(Ce) detector for in situ measurements on the ground-surface and in boreholes

Hasan

Rutten

Camps

et al. 2022

Applied Radiation and Isotopes

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Determination of minimum detectable activity for underwater radiation detection system

Cited by 4 publications

References 12 publications

Design of a Low-Resolution Gamma-ray Spectrometer for Monitoring Radioactive Levels of Wastewater

Design of a Low-Resolution Gamma-ray Spectrometer for Monitoring Radioactive Levels of Wastewater

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

Minimum detectable activity concentration of radio-cesium by a LaBr3(Ce) detector for in situ measurements on the ground-surface and in boreholes

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