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Determination of air-loop volume and radon partition coefficient for measuring radon in water sample.

Lee KY, Burnett WC - J Radioanal Nucl Chem (2013)

Bottom Line: In order to verify this approach, we measured the radon partition coefficient in deionized water in the temperature range of 10-30 °C and compared the values to those calculated from the well-known Weigel equation.The results were within 5 % variance throughout the temperature range.The results have shown good agreement between this method and the standard methods.

View Article: PubMed Central - PubMed

Affiliation: Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon, 305-350 Korea.

ABSTRACT

A simple method for the direct determination of the air-loop volume in a RAD7 system as well as the radon partition coefficient was developed allowing for an accurate measurement of the radon activity in any type of water. The air-loop volume may be measured directly using an external radon source and an empty bottle with a precisely measured volume. The partition coefficient and activity of radon in the water sample may then be determined via the RAD7 using the determined air-loop volume. Activity ratios instead of absolute activities were used to measure the air-loop volume and the radon partition coefficient. In order to verify this approach, we measured the radon partition coefficient in deionized water in the temperature range of 10-30 °C and compared the values to those calculated from the well-known Weigel equation. The results were within 5 % variance throughout the temperature range. We also applied the approach for measurement of the radon partition coefficient in synthetic saline water (0-75 ppt salinity) as well as tap water. The radon activity of the tap water sample was determined by this method as well as the standard RAD-H2O and BigBottle RAD-H2O. The results have shown good agreement between this method and the standard methods.

No MeSH data available.


Flow chart for the determination of radon activity of water used in this work. Three steps: (1) determination of the air volume of system (V1, V2, Vt): (a), (2) determination of the radon partition coefficient (k): (b), (3) determination of radon activity of the water sample (Cws): (c)
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Fig2: Flow chart for the determination of radon activity of water used in this work. Three steps: (1) determination of the air volume of system (V1, V2, Vt): (a), (2) determination of the radon partition coefficient (k): (b), (3) determination of radon activity of the water sample (Cws): (c)

Mentions: Figure 2 shows a flow chart for the determination of both the radon k and the radon activity in water samples used in this work. As shown in the figure, the volume of the air-loops is determined first by using an external Rn source. Next, the radon k is determined using one aliquot of the water sample itself. Finally, the radon activity in another portion of the same water sample is determined by applying the radon k and the determined radon activity in the air-loop, and the volumes of air-loops and water.Fig. 2


Determination of air-loop volume and radon partition coefficient for measuring radon in water sample.

Lee KY, Burnett WC - J Radioanal Nucl Chem (2013)

Flow chart for the determination of radon activity of water used in this work. Three steps: (1) determination of the air volume of system (V1, V2, Vt): (a), (2) determination of the radon partition coefficient (k): (b), (3) determination of radon activity of the water sample (Cws): (c)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4514466&req=5

Fig2: Flow chart for the determination of radon activity of water used in this work. Three steps: (1) determination of the air volume of system (V1, V2, Vt): (a), (2) determination of the radon partition coefficient (k): (b), (3) determination of radon activity of the water sample (Cws): (c)
Mentions: Figure 2 shows a flow chart for the determination of both the radon k and the radon activity in water samples used in this work. As shown in the figure, the volume of the air-loops is determined first by using an external Rn source. Next, the radon k is determined using one aliquot of the water sample itself. Finally, the radon activity in another portion of the same water sample is determined by applying the radon k and the determined radon activity in the air-loop, and the volumes of air-loops and water.Fig. 2

Bottom Line: In order to verify this approach, we measured the radon partition coefficient in deionized water in the temperature range of 10-30 °C and compared the values to those calculated from the well-known Weigel equation.The results were within 5 % variance throughout the temperature range.The results have shown good agreement between this method and the standard methods.

View Article: PubMed Central - PubMed

Affiliation: Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon, 305-350 Korea.

ABSTRACT

A simple method for the direct determination of the air-loop volume in a RAD7 system as well as the radon partition coefficient was developed allowing for an accurate measurement of the radon activity in any type of water. The air-loop volume may be measured directly using an external radon source and an empty bottle with a precisely measured volume. The partition coefficient and activity of radon in the water sample may then be determined via the RAD7 using the determined air-loop volume. Activity ratios instead of absolute activities were used to measure the air-loop volume and the radon partition coefficient. In order to verify this approach, we measured the radon partition coefficient in deionized water in the temperature range of 10-30 °C and compared the values to those calculated from the well-known Weigel equation. The results were within 5 % variance throughout the temperature range. We also applied the approach for measurement of the radon partition coefficient in synthetic saline water (0-75 ppt salinity) as well as tap water. The radon activity of the tap water sample was determined by this method as well as the standard RAD-H2O and BigBottle RAD-H2O. The results have shown good agreement between this method and the standard methods.

No MeSH data available.