A twin-type airflow pulse ionization chamber for continuous alpha-radioactivity monitoring in atmosphere

Kada, Wataru; Dwaikat, Nidal; Datemichi, Jun; Sato, F.; Murata, Isao; Kato, Yoshiaki; Iida, Toshiyuki

doi:10.1016/j.radmeas.2010.07.032

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…The advantage of the PIC is that it is insensitive to relative humidity, and it was reported that less than 5 % accuracy error was achieved under 65 % relative humidity [ 16 ]. However, if water vapor condenses at 70 % or above, condensed water drops tend to capture electric charges and reduce collection efficiency [ 17 ]. Thus, the actual radon concentration >70 % humidity was greater than the measured value.…”

Section: Methodsmentioning

confidence: 99%

Radon concentration and affecting environmental conditions in water-curtain heated cultivation facilities

Nam,

Kim,

Shin

et al. 2024

Heliyon

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Section: Methodsmentioning

confidence: 99%

Radon concentration and affecting environmental conditions in water-curtain heated cultivation facilities

Nam,

Kim,

Shin

et al. 2024

Heliyon

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“…It is reported that air with relative humidity up to 80% has only a minor influence on the PIC measuring efficiency since the PIC detects these electrical microspace charges (Seo and Kim, 2021). As a result, the absolute efficiency of a PIC sensor is higher than that of other traditional detectors, such as semiconductor and scintillator detectors affected by moisture (Kada et al, 2010). Despite that, drying units were still implemented in the system to avoid corrosion of the PIC detector (its metal wall and needle) in a high humidity environment.…”

Section: Ouc-rn System Setupmentioning

confidence: 99%

In-situ radon-in-water detection for high resolution submarine groundwater discharge assessment

Zhao

Burnett

et al. 2022

Front. Mar. Sci.

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Submarine groundwater discharge (SGD), including both land-based fresh groundwater that enters the ocean from coastal aquifers as well as recirculated seawater that is continuously recharged and discharged on the seabed, has been considered as an important component of the global water and biogenic element (e.g., nitrogen, phosphorus, silicon and carbon) sources and a significant pathway for material exchange at the land-sea interface of coastal ecosystems. Some researchers reported that SGD associated nutrient additions to coastal waters have caused unwanted ecological issues, including red tides, coastal acidification and hypoxia. Natural radon isotope (222Rn, t1/2 = 3.8 d) is an excellent tracer for studying SGD and other oceanographic processes including air-sea gas exchange, sediment-water diffusion, and earthquake prediction. However, the conventional radon measurement methods suffer many technical disadvantages. We consequently developed a convenient submersible radon determination approach (“OUC-Rn”) using a commercial pulsed ionization chamber (PIC) radon sensor and gas extraction membrane module to produce high precision and high resolution observations. We demonstrate the radon degassing efficiency of the membrane contactor is comparable to the shower-head type air-water exchanger but is independent of operating position. The radon measurement efficiency of the PIC is 2-fold higher than the RAD7 detector and is far less influenced by moisture. We successfully deployed the system in 2.5 meters water depth over a 100 hours period in an anthropogenic influenced bay. Based on our high temporal resolution observations, the SGD flux was estimated to be 0-43.0 cm/d (mean: 25.4 ± 14.5 cm/d). The SGD fluxes pattern plotted together with the tidal variations revealed that tidal pumping may be the main force driving seawater recirculation into aquifers and thus affecting nutrient, carbon and other dissolved matters dynamics in coastal regions.

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Gas Ionization Detectors

Steinhäuser

Buchtela

2012

Handbook of Radioactivity Analysis

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A twin-type airflow pulse ionization chamber for continuous alpha-radioactivity monitoring in atmosphere

Cited by 6 publications

References 15 publications

Radon concentration and affecting environmental conditions in water-curtain heated cultivation facilities

Radon concentration and affecting environmental conditions in water-curtain heated cultivation facilities

In-situ radon-in-water detection for high resolution submarine groundwater discharge assessment

Gas Ionization Detectors

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