You are seeing reference results for absolute isotopic abundance measurement because there's not a match on Dictionary.com.
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pubs.acs.org/doi/abs/10.1021/ja01504a005
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An absolute value for the isotopic abundance ratio of natural silver is obtained by the use of ... the probability of systematic errors in the measurement of Ag+ ions ...
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nvlpubs.nist.gov/nistpubs/jres/066/1/V66.N01.A01.pdf
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Collateral measurements of known mixtures of nearly pure silver isotopes permit the determination of absolute abundance ratios. Native silver from Cobalt, ...
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nvlpubs.nist.gov/nistpubs/jres/070/2/V70.N02.A09.pdf
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Absolute values have been obtained for the isotopic abundance ratios of a reference sample of chromium ... purported to be absolute measurements of the chro- ...
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nistdigitalarchives.contentdm.oclc.org/cdm/compoundobje...
nistdigitalarchives.contentdm.oclc.org/cdm/compoundobject/collection/p13011coll6/id/41616/rec/3
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In the case of ratios near one, this bias reduces to isotopic fractionation. These measured biases are then used to calculate the absolute isotopic abundance ...
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nistdigitalarchives.contentdm.oclc.org/cdm/compoundobje...
nistdigitalarchives.contentdm.oclc.org/cdm/compoundobject/collection/p13011coll6/id/58128/rec/19
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The determination of the absolute isotopic abundance and atomic weight of any ... The mass spec trometers use d for the isotop ic abundance measure men ts a ...
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www.uga.edu/sisbl/stable.html
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Delta values are not absolute isotope abundances but differences between sample readings and one or another of the ...
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pubs.usgs.gov/wri/wri014222/
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Aug 16, 2010 ... Because reference materials used for absolute isotope-abundance measurements have not been included in relative isotope abundance ...
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old.iupac.org/reports/1998/7001rosman/iso.pdf
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Membership of the Subcommittee for Isotopic Abundance Measurements ...... Absolute Isotopic Abundance Ratios and the Atomic Weight of Chlorine. 63LEI1 ...
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www.sciencedirect.com/science/article/pii/0016703758900...
www.sciencedirect.com/science/article/pii/0016703758900826
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However, the absolute accuracy of the abundance measurements was limited to 1 part in ... Re-examination of the nitrogen isotope abundance problem seemed ...
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onlinelibrary.wiley.com/doi/10.1002/rcm.857/pdf
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The differential measurement of the abundance of oxygen isotopes based on reference materials, .... The measurement of the absolute isotope ratio for 2H in ...
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