On-Chip Microplasmas for the Detection of Radioactive Cesium Contamination in Seawater

Joffrion, Joshua B.; Mills, D. S.; Clower, William; Wilson, Curtis M.

doi:10.3390/mi8090259

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…The modeled breakdown field at the tip of the needle, E tip /N, obtained in this work using the experimental breakdown voltages for each tested gas was in the range from ~10 3 Td to ~10 5 Td. This field was used to obtain the reduced breakdown field, E tip /N.…”

Section: Discussionmentioning

confidence: 99%

“…In recent years, the breakdown properties of sub-mm gas-filled gaps have received significant attention in the literature on gas discharge and breakdown. Understanding of the breakdown properties of sub-mm inter-electrode gaps is required for the optimization of miniature gas-insulated systems; for the development of novel systems such as microplasma "lab on a chip" devices [3,4]; for the detection of different chemical compounds and elements [5]; for the development of micro-hollow cathode discharge systems [6] and miniature dielectric barrier discharge devices [7].…”

Section: Introductionmentioning

confidence: 99%

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The Nanosecond Impulsive Breakdown Characteristics of Air, N2 and CO2 in a Sub-mm Gap

Liu

Timoshkin

Wilson

et al. 2021

Plasma

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The present paper investigates the breakdown characteristics—breakdown voltage, with breakdown occurring on the rising edge of the applied HV impulses, and time to breakdown—for gases of significance that are present in the atmosphere: air, N2 and CO2. These breakdown characteristics have been obtained in a 100 µm gap between an HV needle and plane ground electrode, when stressed with sub-µs impulses of both polarities, with a rise time up to ~50 ns. The scaling relationships between the reduced breakdown field Etip/N and the product of the gas number density and inter-electrode gap, Nd, were obtained for all tested gases over a wide range of Nd values, from ~1020 m−2 to ~1025 m−2. The breakdown field-time to breakdown characteristics obtained at different gas pressures are presented as scaling relationships of Etip/N, Nd, and Ntbr for each gas, and compared with data from the literature.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Nanosecond Impulsive Breakdown Characteristics of Air, N2 and CO2 in a Sub-mm Gap

Liu

Timoshkin

Wilson

et al. 2021

Plasma

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“…The breakdown thresholds in various conditions and the transition from Townsend avalanche to field emission-driven breakdown were demonstrated, which would be vital to the electrical breakdown theory at microscale. Meanwhile, understanding the fundamental mechanism of gas breakdown at microscale will have far reaching impact on practical devices due to the numerous applications that leverage microplasmas [21], including excimer lamps with emissions in the VUV [58], ozone generators [59], arrays for flat panel light sources [60], nanoparticle synthesis [61], medicine [62], environmental remediation [63], detectors [64,65], microthrusters [66], and combustion [67]. While a lot of numerical calculation work devoted to this subject could be found in somewhere else, this chapter focuses on the experimental investigations of breakdown behaviors in microgaps, which helps to pave the way for insulation design and discharge applications at small scales.…”

Section: Discussionmentioning

confidence: 99%

Electrical Breakdown Behaviors in Microgaps

Meng¹,

Cheng²

2019

Electrostatic Discharge - From Electrical Breakdown in Micro-Gaps to Nano-Generators

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The study of electrical breakdown behaviors in microgaps has drawn intensive attention around the world due to the miniaturization of electronic devices that allows electronic circuits to be packaged more densely, making possible compact computers, advanced radar and navigation systems, and other devices that use very large numbers of components. Therefore, a clear understanding of the electrical breakdown behaviors in microgaps is required to avoid the dielectric breakdown or to trigger the breakdown at microscale. This chapter introduces the significance of understanding breakdown characterization and reliability assessment for electrostatically actuated devices, magnetic recording devices, photomasks, RF MEMS switches, and micromachines and points out the derivation of the classical Paschen's law at microscale. Then it summarizes the state-of-the-art research work on the methodology, influencing factors, dynamics, and physical mechanisms of electrical breakdown in microgaps, which is expected to expand the general knowledge of electrical breakdown to the microscale regime or more and benefits the reliability assessment and ESD protection of microscale and nanoscale devices.

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“…This catastrophic event led to the release of various radioactive substances, including iodine-131 ( 131 I), cesium-137 ( 137 Cs), and cesium-134 ( 134 Cs), into the environment, notably contaminating the surrounding areas [ 2 ]. Consequently, monitoring for radioactive cesium became imperative [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Low-Cost Sensor Deployment on a Public Minibus in Fukushima Prefecture

Omega,

Ishigaki,

Permana

et al. 2024

Sensors

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This study analyzed radiation dose data to observe the annual decline in ambient radiation doses and assess the factors contributing to fluctuations in reconstructed areas of the Fukushima prefecture. Utilizing a novel mobile monitoring system installed on a community minibus, the study employed a cost-effective sensor, namely, Pocket Geiger which was integrated with a microcontroller and telecommunication system for data transfer, access, visualization, and accumulation. The study area included the region between Okuma and Tomioka towns. The ambient dose rate recorded along the minibus route was depicted on a map, averaged within a 1 × 1 km mesh created with the Quantum Geographic Information System. To ensure accuracy, the shielding factor of the minibus material is determined to adjust the dose readings. A significant decrease (p < 0.001) in the radiation dose ranges from 2022 to 2023 was observed. The land use classification by the Advanced Land Observation Satellite revealed an ecological half-life ranging from 2.41 years to 1 year, suggesting a rapid radiation decay across all land types. This underscores the close connection between radiation attenuation and environmental factors, as well as decontamination efforts across diverse land categories.

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On-Chip Microplasmas for the Detection of Radioactive Cesium Contamination in Seawater

Cited by 9 publications

References 8 publications

The Nanosecond Impulsive Breakdown Characteristics of Air, N2 and CO2 in a Sub-mm Gap

The Nanosecond Impulsive Breakdown Characteristics of Air, N2 and CO2 in a Sub-mm Gap

Electrical Breakdown Behaviors in Microgaps

Low-Cost Sensor Deployment on a Public Minibus in Fukushima Prefecture

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