Development of mobile scanning system for effective in-situ spatial prediction of radioactive contamination at decommissioning sites

Lee, Chanki; Park, Se Won; Kim, Hee Reyoung

doi:10.1016/j.nima.2020.163833

Cited by 9 publications

(15 citation statements)

References 41 publications

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“…Among survey activities, scanning and direct measurement are conducted sequentially on site, and the detectability is highly dependent on the scan speed and measurement time, respectively. It is important that static and scan (for beta emitters) minimum detectable concentrations (MDCs), as in Equations ( 1) and ( 2) [12,17,18], which are quantitative measures of the measurability, should be lower than the DCGLs (gross or radionuclide-specific) in scanned areas for appropriate decision making.…”

Section: ) Characterizationmentioning

confidence: 99%

“…For a more efficient and effective survey, our team suggested on-site measurement techniques for alpha, beta, and gamma activity in surface soil. For example, Lee et al [12] developed a vehicle-based mobile scanning system of gross alpha/beta and gamma activities, using five ZnS(Ag) and polyvinyltoluene (PVT) phoswich detectors (Fig. 1) and a gamma-ray spectrometer comprising two NaI(Tl) surrounded by PVT, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of the gamma-ray spectrometer was successfully tested in cases of timely detecting, tracking hotspots, and estimating depth profiles [12]. When potentially contaminated areas were scanned and hotspots with higher radioactivity levels were detected, rapid quantitative analysis of gamma radionuclides would be conducted by direct measurement of hotspots.…”

Section: Introductionmentioning

confidence: 99%

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Preliminary Study on Rapid Measurement of Gross Alpha/Beta and 90Sr Activities in Surface Soil by Mobile ZnS(Ag)/PTV Array and Handheld PVT Rod with Gated Energy Channels

Lee¹,

Kim²

2021

J Radiat Prot Res

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Background: Surface soil radiation monitoring around nuclear facilities is important to classify and characterize the contaminated areas. A scanning and direct measurement technique can survey the sites rapidly before starting sampling analysis.Materials and Methods: Regarding this, we test and suggest a measurement technique for gross alpha/beta and 90Sr activities in surface soil based on a mobile ZnS(Ag)/PVT (polyvinyltoluene) array and a handheld PVT rod, respectively. To detect 90Sr selectively in soil mixed with naturally occurring radioactive materials, chosen energy channel counts from the multichannel analyzers were used instead of whole channel counts. Soil samples contaminated with exempt liquid 90Sr with 1 Bq· g-1, 3 Bq· g-1, and 10 Bq· g-1 were prepared and hardened by flocculation.Results and Discussion: The mobile ZnS(Ag)/PVT array could discriminate gross alpha, gross beta, and gamma radiation by the different pulse-shaped signal features of each sensor material. If the array is deployed on a vehicle, the scan minimum detectable concentration (MDC) range will be about 0.11–0.17 Bq· g-1 at 18 km· hr-1 speed, highly sensitive to actual sites. The handheld PVT rod with 12 mm (Φ) × 20 mm (H) size can directly measure 90Sr selectively if channels on which energies are from 1,470 and 2,279 keV are gated, minimizing crossdetection of other radionuclides. These methods were verified by measuring soil samples fabricated with homogeneous 90Sr concentrations, showing static MDC of 2.16 Bq· g-1 at a measurement time of 300 seconds.Conclusion: Based on the results, comprehensive procedures using these detectors are suggested to optimize soil sites survey.

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Section: ) Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preliminary Study on Rapid Measurement of Gross Alpha/Beta and 90Sr Activities in Surface Soil by Mobile ZnS(Ag)/PTV Array and Handheld PVT Rod with Gated Energy Channels

Lee¹,

Kim²

2021

J Radiat Prot Res

Self Cite

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“…In terms of radiation management, radioactive waste generated from nuclear facilities requires thorough radiological measurement and evaluation because there is a possibility of radiation exposure of workers and the release of radioactive materials into the environment during decommissioning. The scintillation detector widely used for in situ measurements is one of the most representative methods of indirect ionization and consists of a scintillator and an optical sensor [18][19][20][21][22]. The scintillator interacts with radiation such as gamma-rays and then emits light in the UV or visible region, and the photosensor converts the light into an electrical signal.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Plastic Scintillator for Detection of Gamma-Rays: Simulation and Experimental Study

Min

Kim

et al. 2021

Chemosensors

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Plastic scintillators are widely used in various radiation measurement applications, and the use of plastic scintillators for nuclear applications including decommissioning, such as gamma-ray detection and measurement, is an important concern. With regard to efficient and effective gamma-ray detection, the optimization for thickness of plastic scintillator is strongly needed. Here, we elucidate optimization of the thickness of high-performance plastic scintillator using high atomic number material. Moreover, the EJ-200 of commercial plastic scintillators with the same thickness was compared. Two computational simulation codes (MCNP, GEANT4) were used for thickness optimization and were compared with experimental results to verify data obtained by computational simulation. From the obtained results, it was confirmed that the difference in total counts was less than 10% in the thickness of the scintillator of 50 mm or more, which means optimized thickness for high efficiency gamma-ray detection such as radioactive 137Cs and 60CO. Finally, simulated results, along with experimental data, were discussed in this study. The results of this study can be used as basic data for optimizing the thickness of plastic scintillators using high atomic number elements for radiation detection and monitoring.

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“…However, these systems are not installed at regular intervals around nuclear facilities. In addition, it is difficult to predict the behavior of radionuclides in the event of a radioactive material leakage accident [47][48][49]. Until now, there has been no means to evaluate the behavior of radioactive materials, other than the predicted scenarios through simulation.…”

Section: Introductionmentioning

confidence: 99%

Wireless Backpack System for Detection of Radioactive Cesium on Contaminated Soil Using Portable Plastic Scintillator with Efficient Readout Device

Min

Seo

et al. 2021

Electronics

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The miniaturization and usability of radiation detectors make it increasingly possible to use mobile instruments to detect and monitor gamma radiations. Here, a Bluetooth-based mobile detection system for integrated interaction in a backpack was designed and implemented to smart equipment for the detection of radioactive cesium on contaminated soil. The radiation measurement system was demonstrated in the form of a backpack using a quantum dot (QD)-loaded plastic scintillator manufactured and prepared directly in this study, and it can be measured by a person in the wireless framework of integrated interaction. The QD-loaded plastic scintillator was measured after setting the distance from the contaminated soil to 20, 50, and 100 mm. As a result, the detection efficiency of the commercial plastic scintillator (EJ-200) was calculated to be 11.81% and that of the QD-loaded plastic scintillator was 15.22%, which proved the higher detection efficiency performance than the commercial plastic scintillator. The measurement result was transmitted to a personal computer using Bluetooth as a portable system. In the future, this wireless system design could be expanded as a wireless communication system equipped with a global positioning system to detect and measure radioactively contaminated environments.

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Development of mobile scanning system for effective in-situ spatial prediction of radioactive contamination at decommissioning sites

Cited by 9 publications

References 41 publications

Preliminary Study on Rapid Measurement of Gross Alpha/Beta and 90Sr Activities in Surface Soil by Mobile ZnS(Ag)/PTV Array and Handheld PVT Rod with Gated Energy Channels

Preliminary Study on Rapid Measurement of Gross Alpha/Beta and 90Sr Activities in Surface Soil by Mobile ZnS(Ag)/PTV Array and Handheld PVT Rod with Gated Energy Channels

Optimization of Plastic Scintillator for Detection of Gamma-Rays: Simulation and Experimental Study

Wireless Backpack System for Detection of Radioactive Cesium on Contaminated Soil Using Portable Plastic Scintillator with Efficient Readout Device

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