Isotopic Compositions of the Elements 2013

Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; Bièvre, Paul De; Gröning, Manfred; Holden, N.E.; Irrgeher, Johanna; Loss, Robert D.; Walczyk, Thomas; Prohaska, Thomas

doi:10.1515/iupac.88.0004

Cited by 23 publications

(41 citation statements)

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“…This state of knowledge may pertain to a particular person or to a group of persons, typically a scientific community. For example, Meija et al [7] (Table 1) list A r (Ge) = 72.630 (8). This conveys the belief (indeed the practically full certainty) of the CIAAW that the atomic weight of germanium in every sample of a "normal" material lies between 72.622 and 72.638.…”

Section: Uncertaintymentioning

confidence: 87%

“…Marine sources (seawater, hydrothermal fluids, foraminifera shells, carbonate sediments, brines, and pore water) have values of δ LSVEC ( 7 Li) between −10 ‰ and +56 ‰ [21, table 5] (the "delta" notation is described in §4). However, enrichment in 7 Li as high as +354 ‰ has been measured in ground water underlying West Valley Creek in Pennsylvania (USA), likely in consequence of the release of left-over lithium-7 into the environment from a nearby facility that produced 6 Li-enriched lithium for use in the nuclear industry [21,Page 13]. The fact that states-of-knowledge typically will vary between people and between communities, does not in any way detract from the value they add to the estimates of the corresponding quantities.…”

Section: Uncertaintymentioning

confidence: 94%

“…For example, the standard atomic weight of molybdenum is 95.95(1) [7], which means that A r (Mo) = 95.95 and that the associated decisional expanded uncertainty is U[A r (Mo)] = 0.01. In general, the interval from A r (E) − U[A r (E)] to A r (E) + U[A r (E)] is believed to encompass the atomic weight values of element E in essentially all "normal" materials.…”

Section: Expressions Of Uncertainty For Atomic Weightsmentioning

confidence: 99%

“…This choice was reaffirmed when the CIAAW published the 2011 version of the atomic weights, and added bromine and magnesium to the list of elements whose standard atomic weights are expressed as intervals [6]. The same approach has been used in the 2013 version of the standard atomic weights [7]. The 2009 recommendation to use interval notation did achieve the valuable educational goal of drawing attention to the fact that isotopic composition can vary among natural materials, hence so do the atomic weights [8].…”

Section: Introductionmentioning

confidence: 99%

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Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report)

Possolo

Veen

Meija

et al. 2018

Pure and Applied Chemistry

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Abstract:In 2009, the Commission on Isotopic Abundances and Atomic Weights (CIAAW) of the International Union of Pure and Applied Chemistry (IUPAC) introduced the interval notation to express the standard atomic weights of elements whose isotopic composition varies significantly in nature. However, it has become apparent that additional guidance would be helpful on how representative values should be derived from these intervals, and on how the associated uncertainty should be characterized and propagated to cognate quantities, such as relative molecular masses. The assignment of suitable probability distributions to the atomic weight intervals is consistent with the CIAAW's goal of emphasizing the variability of the atomic weight values in nature. These distributions, however, are not intended to reflect the natural variability of the abundances of the different isotopes in the earth's crust or in any other environment. Rather, they convey states of knowledge about the elemental composition of "normal" materials generally, or about specific classes of such materials. In the absence of detailed knowledge about the isotopic composition of a material, or when such details may safely be ignored, the probability distribution assigned to the standard atomic weight intervals may be taken as rectangular (or, uniform). This modeling choice is a reasonable and convenient default choice when a representative value of the atomic weight, and associated uncertainty, are needed in calculations involving atomic and relative molecular masses. When information about the provenance of the material, or other information about the isotopic composition needs to be taken into account, then this distribution may be non-uniform. We present several examples of how the probability distribution of an atomic weight or relative molecular mass may be characterized, and also how it may be used to evaluate the associated uncertainty.

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Section: Uncertaintymentioning

confidence: 87%

Section: Uncertaintymentioning

confidence: 94%

Section: Expressions Of Uncertainty For Atomic Weightsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report)

Possolo

Veen

Meija

et al. 2018

Pure and Applied Chemistry

Self Cite

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“…The intensive R&D in progress of molybdenum-containing scintillators is driven by the strong interest to the isotope 100 Mo, which is one of the most perspectives due to the high decay energy (Q 2 = 3034.40 (17) keV [10]), a possibility of mass scale isotopic enrichment (natural isotopic abundance  = 9.744(65)% [11]) and promising theoretical estimations of the decay probability (see, e.g., Ref. [6] and references therein beta decay experiment with a sensitivity on the level of the inverted hierarchy of the neutrino mass pattern [12,13].…”

mentioning

confidence: 99%

Li2MoO4 Crystals Grown by Low-Thermal-Gradient Czochralski Technique

Grigorieva¹,

Shlegel²,

Bekker³

et al. 2017

JMSE-B

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Search for New Molybdenum‐Based Crystal Scintillators for the Neutrino‐Less Double Beta Decay Search Experiment

Kim

Pandey

Khan

et al. 2019

Crystal Research and Technology

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grown by a Czochralski method. Syntheses of the polycrystalline materials are discussed based on the thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) analysis and the crystals' structures are reported based on the X-ray powder diffraction (XRD) analysis. Luminescence properties of the crystals from room temperature to 10 K are studied by exciting the crystal with a 280 nm light emitting diode (LED). The scintillation light yields of the crystals at different low temperatures are studied by exciting the crystal with strontium-90 ( 90 Sr) beta source. The developed crystals are not luminescent at room temperature. At cryogenic temperature, however, they become luminescent with longer decay times. This work also reports on the luminescence and scintillation properties of ZnMoO 4 , PbMoO 4 , Pb 2 MoO 5 , and CaMoO 4 crystals which have been grown at other institutes. The newly developed crystals' results are compared with the result of a standard CaMoO 4 crystal. Among the new Mo-based crystals, the Na 2 Mo 2 O 7 crystal shows the most promising properties for the neutrino-less double beta decay (0 ) search experiments at cryogenic temperature.

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Isotopic Compositions of the Elements 2013

Cited by 23 publications

References 0 publications

Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report)

Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report)

Li2MoO4 Crystals Grown by Low-Thermal-Gradient Czochralski Technique

Search for New Molybdenum‐Based Crystal Scintillators for the Neutrino‐Less Double Beta Decay Search Experiment

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