isotope dilution


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isotope dilution

[′ī·sə‚tōp də‚lü·shən]
(nucleonics)
The introduction of a radioisotope into stable isotopes of an element in order to make volume, mass, and age measurements of the element.
References in periodicals archive ?
The investigation was undertaken to resolve a discrepancy in evaluation of mole fractions obtained with previous measurements of enriched 28Si using isotope dilution mass spectrometry.
[1] Nonstandard abbreviations: LC-MS, liquid chromatography-mass spectrometry; apo, apolipoprotein; CLSI, Clinical and Laboratory Standards Institute; SID-MRM, stable isotope dilution and multiple reaction monitoring; QC, quality control.
Twenty odorants were quantified by stable isotope dilution assays.
In a community setting in Zambia, the VA equivalency of PVA-carotenoids from biofortified maize in a 90-day feeding trial was estimated as 10.4:1, by comparing the mean change in total body VA stores assessed by the retinol isotope dilution test [7] in children who consumed either biofortified maize with a placebo dose, or non-biofortified maize with a VA dose [8].
Alpha spectrometry for impurities was also performed as a part of the isotope dilution analysis.
Therefore, the present study was designed to evaluate the effect of the RSUM-diet on turnover rates (TR) of plasma glucose and Leu using the isotope dilution methods along with the determination of N balances rumen characteristics and blood metabolite concentrations in sheep.
In 2008, The French Society of Clinical Biology (SFBC) conducted a multicentric evaluation of isotope dilution mass spectrometry (IDMS)-traceable creatinine enzymatic and nonstandardized cystC assays (2) using a panel of 5 off-the-clot, fresh-frozen serum pools prepared to cover concentrations critically important at initial stages of renal disease.
However, the physicochemical properties of select alpha-emitters ([sup.210]Po, [sup.228]Th, and certain U isotopes) allow for chemical extraction and analysis by isotope dilution alpha spectrometry techniques.
“The ICP-MS also allows us to offer isotope dilution analysis, meaning that we will be able to analyse archaeological, blood, hair and plant samples.”
Carr, "Quantitative, multiplexed assays for low abundance proteins in plasma by targeted mass spectrometry and stable isotope dilution," Molecular and Cellular Proteomics, vol.
Isotope dilution, dual photon, whole-body counting, hydrodensitometry, and anthropometric methods were used either alone or in combination to produce multicomponent models.
In addition, the concentration of influenza virus NP antigen (the antigen detected by RIDTs) was measured as [micro]g/mL using isotope dilution tandem mass spectrometry (1).