Identification of 236U in commercially available uranium compounds by alpha particle spectrometry

Iturbe, J.L.

doi:10.1016/0883-2889(92)90249-e

Cited by 10 publications

(4 citation statements)

References 10 publications

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“…These values do not correspond to those of natural uranium, ~1 and 0.046 respectively (Brennecka et al, 2010). However, this is in agreement with the values measure in commercial uranium reagents (Iturbe, 1992). Specifically, the 234 U/ 238 U isotopic ratio for U-UTEVA-2 sample is 20% lower than the ratios obtained for U-TBP-1, U-TBP-2 and U-UTEVA-1 samples, and it is also 40% higher for the 235 U/ 238 U ratio (see Table 1).…”

Section: Uranium Fractionssupporting

confidence: 51%

Comparison of solvent extraction and extraction chromatography resin techniques for uranium isotopic characterization in high-level radioactive waste and barrier materials

Hurtado

Villa-Alfageme

Mas

et al. 2018

Applied Radiation and Isotopes

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The development of Deep Geological Repositories (DGP) to the storage of high-level radioactive waste (HLRW) is mainly focused in systems of multiple barriers based on the use of clays, and particularly bentonites, as natural and engineered barriers in nuclear waste isolation due to their remarkable properties. Due to the fact that uranium is the major component of HLRW, it is required to go in depth in the analysis of the chemistry of the reaction of this element within bentonites. The determination of uranium under the conditions of HLRW, including the analysis of silicate matrices before and after the uranium-bentonite reaction, was investigated. The performances of a state-of-the-art and widespread radiochemical method based on chromatographic UTEVA resins, and a well-known and traditional method based on solvent extraction with tri-n-butyl phosphate (TBP), for the analysis of uranium and thorium isotopes in solid matrices with high concentrations of uranium were analysed in detail. In the development of this comparison, both radiochemical approaches have an overall excellent performance in order to analyse uranium concentration in HLRW samples. However, due to the high uranium concentration in the samples, the chromatographic resin is not able to avoid completely the uranium contamination in the thorium fraction.

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Section: Uranium Fractionssupporting

confidence: 51%

Comparison of solvent extraction and extraction chromatography resin techniques for uranium isotopic characterization in high-level radioactive waste and barrier materials

Hurtado

Villa-Alfageme

Mas

et al. 2018

Applied Radiation and Isotopes

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“…ICP-MS with the high-efficiency solution introduction system APEX offers high sensitivity for the determination of 236 U in soil samples and of an extremely low 236 U/ 238 U isotope ratio of about 10 ÿ7 , which is better by more than two orders of magnitude compared to the lowest detectable 236 U/ 238 U value by a-spectrometry (Sanchez et al, 1992;Iturbe, 1992). The detection limit for 236 U by ICP-MS was between 3 Â 10 ÿ14 g g ÿ1 and 4 Â 10 ÿ13 g g ÿ1 depending on the natural uranium concentration in soils.…”

Section: Discussionmentioning

confidence: 99%

“…Both isotopes are severe sources of interference in mass spectrometric and radiometric determinations. Due to interfering peaks from the a-decay of 235 U the determination of the 236 U/ 238 U isotopic ratio by a-spectrometry is limited to 3 Â 10 ÿ5 with a relative uncertainty of about 10% (Sanchez et al, 1992;Iturbe, 1992). Typical abundance sensitivity for the uranium isotopic ratio measurements with conventional thermal ionization mass spectrometers (TIMS) is about 10 ÿ7 (Callis and Abernathey, 1991;Sahoo et al, 2002).…”

Section: Introductionmentioning

confidence: 96%

Determination of extremely low 236U/238U isotope ratios in environmental samples by sector-field inductively coupled plasma mass spectrometry using high-efficiency sample introduction

Boulyga

Heumann

2006

Journal of Environmental Radioactivity

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“…Specifically, the measurement of 236 U is made difficult as isobaric interferences arise when small quantities of 236 U exist amidst large 235 U and 238 U quantities. Additionally, the α-decay peak of 235 U can interfere in a 236 U/ 238 U measurement done via α-spectrometry [19,20].…”

Section: Fluence Diagnosticsmentioning

confidence: 99%

Developing Diagnostic Tools for Low-Burnup Reactor Samples

et al. 2017

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We test common fluence diagnostics in the regime of very low burnup natural uranium reactor samples. The fluence diagnostics considered are the uranium isotopics ratios 235 U/ 238 U and 236 U/ 235 U, for which we find simple analytic formulas agree well with full reactor simulation predictions. Both ratios agree reasonably well with one another for fluences in the mid 10 19 n/cm 2 range. However, below about 10 19 n/cm 2 the concentrations of 236 U are found to be sufficiently low that the measured 236 U/ 235 U ratios become unreliable. We also derive and test diagnostics for determining sample cooling times in situations where very low burnup and very long cooling times render many standard diagnostics, such as the 241 Am/ 241 Pu ratio, impractical. We find that using several fragment ratios are necessary to detect the presence of systematic errors, such as fractionation.

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Identification of 236U in commercially available uranium compounds by alpha particle spectrometry

Cited by 10 publications

References 10 publications

Comparison of solvent extraction and extraction chromatography resin techniques for uranium isotopic characterization in high-level radioactive waste and barrier materials

Comparison of solvent extraction and extraction chromatography resin techniques for uranium isotopic characterization in high-level radioactive waste and barrier materials

Determination of extremely low 236U/238U isotope ratios in environmental samples by sector-field inductively coupled plasma mass spectrometry using high-efficiency sample introduction

Developing Diagnostic Tools for Low-Burnup Reactor Samples

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