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Sahoo, Sarata Kumar; Yonehara, Hidenori; Kurotaki, Katsumi; Shiraishi, Kunio; Рамзаев, В. П.; Barkovski, A.

doi:10.1023/a:1006757718985

Cited by 24 publications

(9 citation statements)

References 5 publications

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“…After homogenisation, 500 mg of soil sample was digested using a closed vessel (PTFE vessels) microwave unit (MLS 1200 mega, Italy). After digestion, samples were evaporated to dryness on a hot plate and the residue was dissolved in 5% HNO 3 to yield a sample solution [19].…”

Section: Sample Descriptionmentioning

confidence: 99%

Measurement of uranium and its isotopes at trace levels in environmental samples using mass spectrometry

Sahoo¹

2009

Indian J Phys

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: Actinides have widely entered the environment as a result of nuclear accidents and atmospheric weapon testing. These radionuclides, especially uranium, are outstanding radioactive pollutants, due to their high radiotoxicity and long half-lives. In addition to this, since depleted uranium (DU) has been used in the Balkan conflict in 1999, there has been a concern about the possible consequences of its use for the people and environment. Therefore, accurate, precise and simple determination methods are necessary in order to evaluate the human dose and the concentration and effects of these nuclides in the environment. The principal isotopes of uranium e.g. 235 U and 238 U are of primordial origin and 234 U present in radioactive equilibrium with 238 U. 236 U occurs in nature at ultra trace concentrations with a 236 U : 238 U atom ratio of 10 -14 . Concentrations of uranium in soil samples were determined using inductively coupled plasma mass spectrometry (ICP-MS) and isotope ratios of uranium were measured using a thermal ionisation mass spectrometer. Radioactive dis-equilibrium of 234 U/ 238 U, depletion of 235 U/ 238 U and significant evidence of 236 U/ 238 U were noticed in soil samples.

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Section: Sample Descriptionmentioning

confidence: 99%

Measurement of uranium and its isotopes at trace levels in environmental samples using mass spectrometry

Sahoo¹

2009

Indian J Phys

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“…Some have investigated the inductively coupled plasma-mass spectrometer (ICP-MS) because of its selectivity, sensitivity and accuracy in the detection of different radioactive isotopes. [6][7][8] The newly developed ICP-MS methods have been found to possess higher sensitivity and greater efficiency and may replace many of the radiometric techniques. 9 Furthermore, they are not encumbered with the uncertainty of removing all other beta-emitting nuclides from the sample.…”

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confidence: 99%

Determination of 90Sr at ultratrace levels in urine by ICP-MS

Vonderheide

Zoriy²,

Izmer³

et al. 2004

J. Anal. At. Spectrom.

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Sr appears as a radionuclide in the decay series of nuclear fission and can therefore be found in nuclear waste or released by nuclear accidents. Current methods for the detection of this radionuclide are time consuming and may be prone to a large variety of interferents. In this work, inductively coupled plasma mass spectrometry is explored for the determination of 90 Sr in the presence of stable zirconium in urine. Specific techniques are investigated to remove this as well as other contributions to the background at m/z~90. A quadrupole ICP-MS equipped with a hexapole collision cell is first explored (final LOD~2 ng L 21 for water samples), however, the desired limit of detection for 90 Sr in urine is quite low (0.02 pg L 21). The performance of a double-focusing sector field ICP mass spectrometer (ICP-SFMS) is further investigated, which allows measurement of 90 Sr at the ultratrace level. Other potential interferences were investigated and instrumental detection limits are calculated as 3 pg L 21 for water samples. Final parameters include the use of a cool plasma and medium mass resolution in ICP-SFMS. The method is applied to the analysis of 90 Sr extracted from urine using a crown ether extraction resin and concentrated (enrichment factor: 200); high levels of natural strontium in the separated fraction (of about 1 mg mL 21 ) equate to higher detection limits (80 pg L 21) due to 88 Sr 1 at m/z~90 and the relatively low abundance sensitivity of ICP-SFMS at medium mass resolution of 6 6 10 27 . This detection limit in the separated fraction corresponds to the detection limit of 0.4 pg L 21 in the original urine sample. The recovery of 90 Sr, determined with the developed analytical method in spiked urine samples, was in the range of 82-86%.

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“…Soil samples were digested in PTFE pressure decomposition vessels by heating in a microwave unit (MLS 1200mega, Italy) using a mixture of HNO 3 , HF and HClO 4 [11]. After complete digestion, samples were evaporated to dryness on a hot plate.…”

Section: Chemical Proceduresmentioning

confidence: 99%

Isotopic composition of Uranium in soil and ground water samples collected around 30 km Chernobyl Exclusion Zone

Sahoo¹,

Yoshida²,

Tokonami³

et al. 2009

Radioprotection

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Abstract. Precise and accurate measurement of uranium isotope ratio is essential in environmental monitoring of any contamination in nuclear safeguards. 234 U, 235 U and 238 U are naturally occurring alphaemitting long-lived radionuclides, which are taken up daily at low levels with food and drinking. IUPAC has established natural isotopic composition of 235 U/ 238 U to be 0.00725. Therefore, isotope ratio measurements are important to provide information on the origin of uranium. The isotope ratios of uranium, 234 U/ 238 U, 235 U/ 238 U and 236 U/ 238 U were measured using a VG Sector 54 thermal ionization mass spectrometer (TIMS) as well as high resolution inductively coupled plasma mass spectrometry (ICP-MS) in soil samples as well as in some water samples collected in the exclusion zone of Chernobyl nuclear power plant. The isotopic composition of Chernobyl soil samples showed significant deviation from the natural uranium and presence of 236 U is quite noticeable. The 234 U/ 238 U activity ratio varies in the range 1.06 to 2.1 and 1.42 to 5.75 for soil and water samples, respectively. Enrichment of 235 U was also noticeable for soil as well as ground water samples.

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Cited by 24 publications

References 5 publications

Measurement of uranium and its isotopes at trace levels in environmental samples using mass spectrometry

Measurement of uranium and its isotopes at trace levels in environmental samples using mass spectrometry

Determination of 90Sr at ultratrace levels in urine by ICP-MS

Isotopic composition of Uranium in soil and ground water samples collected around 30 km Chernobyl Exclusion Zone

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