Introduction to U-series Geochemistry

Bourdon, Bernard

doi:10.2113/0520001

Cited by 222 publications

(127 citation statements)

References 34 publications

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“…Uranium isotope ratios are useful signatures in U series geochemistry [1][2][3], radiochronometry/geochronology [4,5], nuclear forensics and nuclear nonproliferation studies [6,7]. Microanalytical techniques including secondary ion mass spectrometry (SIMS) and laser ablation inductively-coupled mass spectrometry (LA-ICP-MS) have made high precision, spatially resolved analysis of U isotope ratios possible, which has yielded new insights into complex materials [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Homogeneity of the Uranium Isotope Composition of NIST SRM 610/611 by MC-ICP-MS, MC-TIMS, and SIMS

et al. 2014

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Abstract:As analytical and microanalytical applications employing uranium isotope ratios increase, so does the need for reliable reference materials, particularly in the fields of geochemistry, geochronology, and nuclear forensics. We present working values for uranium isotopic data of NIST 610/611 glass, collected by multicollector inductively-coupled plasma mass spectrometry (MC-ICP-MS), multicollector thermal ionization mass spectrometry (MC-TIMS), and secondary ion mass spectrometry (SIMS). The presence of depleted U, and, in this case, measureable 236 U, makes NIST 610/611 an ideal candidate for a uranium isotopic reference material for nuclear materials. We analyzed multiple chips of three different NIST 611 wafers and found no heterogeneity in U within or between the wafers, within analytical uncertainty. We determined working values and uncertainties (using a coverage factor of two) using data from this study and the literature for the following U isotope ratios:

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Homogeneity of the Uranium Isotope Composition of NIST SRM 610/611 by MC-ICP-MS, MC-TIMS, and SIMS

et al. 2014

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“…As seen from Eq. (1), there are the 214 Pb and 214 Bi isotopes as a marker of the radionuclides of the U radioactive series (for Th- 212 Pb and 212 Bi, correspondingly), which can be identifi ed soil samples rather easily using low-background gamma spectroscopy methods (see [8]). Therefore, mapping of radioactivity is a perspective method for the evaluation of the near-surface radon concentration.…”

Section: Radiation Mapping Of Environment and Evaluation Of Radon Conmentioning

confidence: 99%

“…For radiation mapping of territory, radionuclides from the U and Th radioactive series, as well as 40 K, could be used as markers for natural or geochemical characteristics of the area and only if the secular equilibrium of their activities is achieved or almost achieved [8,11]. The activity of 40 K natural marker was determined by detection of its single gamma--ray line -1460.8 keV.…”

Section: The Sampling and Measuring Proceduresmentioning

confidence: 99%

The natural radioactivity of the Carpathian national parks and radon evaluation

et al. 2016

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Abstract. The results of the low-background gamma spectrometric measurements of protected mountain areas (Zacharovanyy Kray, Chorne Bahno, Ihthyological Preserve Rika and Uzhanskij National Natural Park) in the region of Primeval Beech Forests of the Transcarpathia, Ukraine, are presented. The distances between sampling points in a single protected area were in the range of 200-400 m in elevation of 300 m; probes were taken from the surface, from depth 20 cm and more than 50 cm. The proposed sampling scheme allows one to investigate the radionuclide concentration in protected area's soils, their distribution on/near the mountain ridges and migration in depth (0-50 cm). We also investigate the infl uence the soils' pH on the contents and the migration of nuclides. The obtained data allow us to study the statistical regularities between the sampling points along and down mountain ridges on the base of their radionuclide content. These results are important for evaluating the radon content/distribution and developing standards in the radionuclide content of the soil Carpathian region.

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“…Detection and quantification of uranium isotopes from its radioactive daughters (Th-234, Pa-234, Ra-226, Po-218, Pb-214, Bi-214, Pb-210, Bi-210, Po-210, and Pb 206) are essential in applications such as nuclear fuel cycle, geological research (oceanography, paleoclimatology, and volcanology), environmental isotope studies, characterization of radioactive waste, and so on [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Isolation of Uranium by Anionic Exchange Resins

Monroy-Guzman¹

2016

JCCE

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Abstract:A separation methodology to isolate natural uranium from its radioactive daughters: Th, Ra, Bi, Pb, Pa and Po, was developed using an only one anion exchange resin and varying concentrations of HCl solutions. Three types of anion exchange resins were tested and the separation process was followed by gamma and alpha spectrometry. Uranium can be quantitatively isolated from its descendants using Dowex 1X8 (20-50 mesh) or Amerlite IRA (100 mesh) resins in three steps: using 4 and 8 mol/L −1 HCl and water to recover uranium. The method is easy, quick, and inexpensive.

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Introduction to U-series Geochemistry

Cited by 222 publications

References 34 publications

Evaluation of the Homogeneity of the Uranium Isotope Composition of NIST SRM 610/611 by MC-ICP-MS, MC-TIMS, and SIMS

Evaluation of the Homogeneity of the Uranium Isotope Composition of NIST SRM 610/611 by MC-ICP-MS, MC-TIMS, and SIMS

The natural radioactivity of the Carpathian national parks and radon evaluation

Isolation of Uranium by Anionic Exchange Resins

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