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Isotopic Abundance

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Isotopic Abundance 

the relative number of atoms of the different isotopes of one chemical element. It is usually expressed as a percentage of the total of all the long-lived (having a half-life T > 3 × 108 years) isotopes of a given element, on the average, either in nature or in some reference state, such as another planet or region. A precise measurement of the isotopic abundance is of great importance in determining the atomic masses of elements.
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Trace Element and REE Geochemistry Trace element, rare-earth-element (REE) and isotopic abundances reflect a variety of factors including the source of the magma, the percentage of the source rock that undergoes melting, the extent of crystal fractionation, and the contamination of either magma from adjacent rocks or from other magmas of other arc systems.
Igneous rock associations 8. Arc magmatism II: geochemical and ... by Murphy, J. Brendan / Geoscience Canada
The first approach uses variations in isotopic abundance of the stable end products arising from radioactive decay.
Stable isotopic tracing--a way forward for nanotechnology by Wong, Herbert / Environmental Health Perspectives
Unfortunately, unscrupulous traders of essential oils or aroma ingredients may decide to adulterate these ingredients with materials that obfuscate the natural 12C/13C isotopic abundance.
New approaches to testing natural fragrances & flavors: Aveda ... by Vainshelboim, Alex; Momoh, Kenneth; Chapman, John; Matravers, Peter; Hayes, Michael / Household & Personal Products Industry
 
 
 
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