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Uranium isotopes in well water samples as drinking sources in some settlements around the Semipalatinsk Nuclear Test Site, Kazakhstan.

Yamamoto M, Tomita J, Sakaguchi A, Ohtsuka Y, Hoshi M, Apsalikov KN - J Radioanal Nucl Chem (2010)

Bottom Line: The results show that (238)U varies widely from 3.6 to 356 mBq/L (0.3-28.7 μg/L), with a factor of about 100.The calculated effective doses to adults resulting from consumption of the investigated waters are in the range 1.0-18.7 μSv/y.Those doses are lower than WHO and IAEA reference value (100 μSv/y) for drinking water.

View Article: PubMed Central - PubMed

Affiliation: Low Level Radioactivity Laboratory, K-INET, Kanazawa University, Wake, Nomi-shi, Ishikawa 923-1224 Japan.

ABSTRACT

Radiochemical results of U isotopes ((234)U, (235)U and (238)U) and their activity ratios are reported for well waters as local sources of drinking waters collected from the ten settlements around the Semipalatinsk Nuclear Test Site (SNTS), Kazakhstan. The results show that (238)U varies widely from 3.6 to 356 mBq/L (0.3-28.7 μg/L), with a factor of about 100. The (238)U concentrations in some water samples from Dolon, Tailan, Sarzhal and Karaul settlements are comparable to or higher than the World Health Organization's restrictive proposed guideline of 15 μg (U)/L. The (234)U/(238)U activity ratios in the measured water samples are higher than 1, and vary between 1.1 and 7.9, being mostly from 1.5 to 3. The measured (235)U/(238)U activity ratios are around 0.046, indicating that U in these well waters is of natural origin. It is probable that the elevated concentration of (238)U found in some settlements around the SNTS is not due to the close-in fallout from nuclear explosions at the SNTS, but rather to the intensive weathering of rocks including U there. The calculated effective doses to adults resulting from consumption of the investigated waters are in the range 1.0-18.7 μSv/y. Those doses are lower than WHO and IAEA reference value (100 μSv/y) for drinking water.

No MeSH data available.


Related in: MedlinePlus

Map showing sampling locations of well waters around Semipalatinsk Nuclear Test Site, Kazakhstan
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Fig1: Map showing sampling locations of well waters around Semipalatinsk Nuclear Test Site, Kazakhstan

Mentions: The settlements where well waters were collected are shown in Fig. 1. These areas are semiarid plains with a low mean annual precipitation (200–300 mm). Total of 35 well water samples was collected from the contaminated settlements such as Dolon, Sarzhal and Karaul around the SNTS. The pH measurement in the water was carried out on a potable pH meter (Model-D-24, Horiba Ltd.) that was calibrated in situ before each set of measurement. The samples were taken in two 200 mL polyethylene bottles without filtration. In addition, about 100 mL of water was collected in light-tight glass bottle for measuring alkalinity; diluted mercuric chloride solution was added to the bottle to prevent decomposition of dissolved organic matter and then the bottle was tightly sealed. For comparison, river surface water sample was also collected from the Irtysh River, which is the largest one among them and flows into the Ob River after leaving this area.Fig. 1


Uranium isotopes in well water samples as drinking sources in some settlements around the Semipalatinsk Nuclear Test Site, Kazakhstan.

Yamamoto M, Tomita J, Sakaguchi A, Ohtsuka Y, Hoshi M, Apsalikov KN - J Radioanal Nucl Chem (2010)

Map showing sampling locations of well waters around Semipalatinsk Nuclear Test Site, Kazakhstan
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4514611&req=5

Fig1: Map showing sampling locations of well waters around Semipalatinsk Nuclear Test Site, Kazakhstan
Mentions: The settlements where well waters were collected are shown in Fig. 1. These areas are semiarid plains with a low mean annual precipitation (200–300 mm). Total of 35 well water samples was collected from the contaminated settlements such as Dolon, Sarzhal and Karaul around the SNTS. The pH measurement in the water was carried out on a potable pH meter (Model-D-24, Horiba Ltd.) that was calibrated in situ before each set of measurement. The samples were taken in two 200 mL polyethylene bottles without filtration. In addition, about 100 mL of water was collected in light-tight glass bottle for measuring alkalinity; diluted mercuric chloride solution was added to the bottle to prevent decomposition of dissolved organic matter and then the bottle was tightly sealed. For comparison, river surface water sample was also collected from the Irtysh River, which is the largest one among them and flows into the Ob River after leaving this area.Fig. 1

Bottom Line: The results show that (238)U varies widely from 3.6 to 356 mBq/L (0.3-28.7 μg/L), with a factor of about 100.The calculated effective doses to adults resulting from consumption of the investigated waters are in the range 1.0-18.7 μSv/y.Those doses are lower than WHO and IAEA reference value (100 μSv/y) for drinking water.

View Article: PubMed Central - PubMed

Affiliation: Low Level Radioactivity Laboratory, K-INET, Kanazawa University, Wake, Nomi-shi, Ishikawa 923-1224 Japan.

ABSTRACT

Radiochemical results of U isotopes ((234)U, (235)U and (238)U) and their activity ratios are reported for well waters as local sources of drinking waters collected from the ten settlements around the Semipalatinsk Nuclear Test Site (SNTS), Kazakhstan. The results show that (238)U varies widely from 3.6 to 356 mBq/L (0.3-28.7 μg/L), with a factor of about 100. The (238)U concentrations in some water samples from Dolon, Tailan, Sarzhal and Karaul settlements are comparable to or higher than the World Health Organization's restrictive proposed guideline of 15 μg (U)/L. The (234)U/(238)U activity ratios in the measured water samples are higher than 1, and vary between 1.1 and 7.9, being mostly from 1.5 to 3. The measured (235)U/(238)U activity ratios are around 0.046, indicating that U in these well waters is of natural origin. It is probable that the elevated concentration of (238)U found in some settlements around the SNTS is not due to the close-in fallout from nuclear explosions at the SNTS, but rather to the intensive weathering of rocks including U there. The calculated effective doses to adults resulting from consumption of the investigated waters are in the range 1.0-18.7 μSv/y. Those doses are lower than WHO and IAEA reference value (100 μSv/y) for drinking water.

No MeSH data available.


Related in: MedlinePlus