Re-certification of a series of uranium isotope reference materials: IRMM-183, IRMM-184, IRMM-185, IRMM-186 and IRMM-187

Stephan, Richter; Alonso, A.; Bolle, W. de; Heinz, Kuehn; Andre, Verbruggen; Wellum, R.; Taylor, Philip

doi:10.1016/j.ijms.2005.07.008

Cited by 35 publications

(16 citation statements)

References 4 publications

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“…For isotope ratio measurements, systematic biases due to matrix effects are well documented in literature [2]. TIMS measurements are less susceptible to such biases and therefore have been more widely applied to certification measurements of isotopic CRMs [3][4][5][6][7][8]. Most commonly used TIMS analytical methods are total evaporation (TE), modified total evaporation (MTE), and conventional analyses.…”

Section: Introductionmentioning

confidence: 99%

Comparison of mass spectrometric methods (TE, MTE and conventional) for uranium isotope ratio measurements

Mathew

Haoszbek

2015

J Radioanal Nucl Chem

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The isotope ratio measurement techniquestotal evaporation (TE), modified total evaporation (MTE), and conventional-used for characterization measurements of certified reference materials by thermal ionization mass spectrometer instruments are compared. The advantages of each method, the fractionation profiles resulting from the measurement techniques, and factors affecting systematic components of bias in the isotope ratio measurements are discussed. The TE and MTE techniques yield major ratios and the conventional and MTE techniques yield minor ratios of comparable quality (in terms of precision and accuracy).

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Section: Introductionmentioning

confidence: 99%

Comparison of mass spectrometric methods (TE, MTE and conventional) for uranium isotope ratio measurements

Mathew

Haoszbek

2015

J Radioanal Nucl Chem

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“…Typically, the 236 U-240 Pu system is the least likely to be affected by postproduction disturbance or contamination. This is because 240 Pu has a relatively short half-life (6,563 years), and the 236 U/ 240 Pu ratio therefore changes relatively quickly, but also because 236 U is either absent or present in very low abundance in natural and low-enriched uranium (LEU) (Richter et al 2005. As a result, contamination of bulk plutonium with natural uranium or LEU will only minimally affect this ratio (Sturm et al 2014).…”

Section: Figurementioning

confidence: 99%

Nuclear Forensic Science: Analysis of Nuclear Material Out of Regulatory Control

Kristo

Gaffney

Marks

et al. 2016

Annu. Rev. Earth Planet. Sci.

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Nuclear forensic science seeks to identify the origin of nuclear materials found outside regulatory control. It is increasingly recognized as an integral part of a robust nuclear security program. This review highlights areas of active, evolving research in nuclear forensics, with a focus on analytical techniques commonly employed in Earth and planetary sciences. Applications of nuclear forensics to uranium ore concentrates (UOCs) are discussed first. UOCs have become an attractive target for nuclear forensic researchers because of the richness in impurities compared to materials produced later in the fuel cycle. The development of chronometric methods for age dating nuclear materials is then discussed, with an emphasis on improvements in accuracy that have been gained from measurements of multiple radioisotopic systems. Finally, papers that report on casework are reviewed, to provide a window into current scientific practice. Ian Hutcheon, our friend, colleague, and mentor, passed away on March 26, 2015, during the writing of this review paper. Ian (PhD, Physics, University of California, Berkeley, 1974)

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“…The instrument was tuned using the NBS-960 standard to achieve flat peak tops and stable signal intensity. Mass fractionation was corrected by bracketing samples with standard NBS U010 using the 238 U/ 234 U ratio of 18,354 (Richter et al, 2005). The more abundant isotopes 238 U and 235 U were measured statically in Faraday cups while the minor U isotope 234 U was measured using the central discrete-dynode secondary electron multiplier (SEM).…”

Section: ( 234 U/ 238 U) Analysismentioning

confidence: 99%

Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet

Linhoff¹

2016

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Thesis AbstractIn the spring and summer within the ablation zone of the Greenland Ice Sheet (GrIS), meltwater drains to the ice sheet bed through an evolving network of efficient channelized and inefficient distributed drainage systems. Distributed system drainage is a key component in stabilizing GrIS velocity on interannual time scales and controlling geochemical fluxes. During the spring and summer of 2011 and 2012, I conducted fieldwork at a large outlet glacier in southwest Greenland underlain by metamorphic silicate rocks. Data collected from a continuous 222 Rn monitor in the proglacial river were used as a component of a mass balance model. I demonstrated that J dis , the 222 Rn fraction derived from the distributed system, was >90% of the 222 Rn flux on average, and therefore, 222 Rn can be used as a passive flow tracer of distributed system drainage. Supraglacial meltwater runoff estimated using two independent models was compared with ice velocity measurements across the glacier's catchment. Major spikes of J dis occurred after rapid supraglacial meltwater runoff inputs and during the expansion of the subglacial channelized system. While increases in meltwater runoff induced ice acceleration, they also resulted in the formation of efficient subglacial channels and increased drainage from the distributed system, mechanisms known to cause slower late summer to winter velocities. Sr, U, and Ra isotopes and major and trace element chemistry were used to investigate the impact of glacial hydrology on subglacial weathering. Analysis of partial and total digestions of the riverine suspended load (SSL) found that trace carbonates within the silicate watershed largely controlled the 87 Sr/ 86 Sr ratio in the dissolved load. Experiments and sampling transects downstream from the GrIS demonstrated that δ 234 U in the dissolved phase decreased with increasing interaction with the SSL. The ( 228 Ra/ 226 Ra) value of the dissolved load was significantly higher than that of the SSL and therefore, was not the result of the source rock material but of extensive mineral surface weathering and the faster ingrowth rate of 228 Ra (t 1/2 =5.75 y) relative to 226

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Re-certification of a series of uranium isotope reference materials: IRMM-183, IRMM-184, IRMM-185, IRMM-186 and IRMM-187

Cited by 35 publications

References 4 publications

Comparison of mass spectrometric methods (TE, MTE and conventional) for uranium isotope ratio measurements

Comparison of mass spectrometric methods (TE, MTE and conventional) for uranium isotope ratio measurements

Nuclear Forensic Science: Analysis of Nuclear Material Out of Regulatory Control

Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet

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