tracer element


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tracer element

[′trā·sər ‚el·ə·mənt]
(chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
First, the BTM ranks tracer elements according to their food-to-soil (F/S) ratios, defined as the mass of the tracer element ingested from food over a 1-d period divided by the mass of the tracer element in 1 g of soil.
In short, SIR data based on each tracer element were characterized by a skewed distribution, high variation, and some outliers.
(MAST), has unveiled that a second, American based, oil company has awarded MAST a USD $4,000,000 contract to evaluate our nanoparticles as a potential tracer element in their secondary oil recovery operations.
In other words, a new set of tracer elements was inserted every time the melt front advanced by 2% of the nodes in the axial direction.
Since the flow velocity near the center is faster than the average velocity, some of the tracer elements will reach and pass the melt front.
Briefly, elements were excluded from the source apportionment modeling if > 90% of the samples had values below the MDL unless they were important tracer elements for potential source types.
Tracer elements used to identify motor vehicle emissions were BC, zinc (Zn), lead (Pb), copper (Cu), and bromine (Br).
From April 1997 through March 1998, samples of inhalable particles were collected, separated into fine and coarse particulate mode, and analyzed for black carbon and tracer elements. At the same time, we examined daily records of children (< 13 years of age) and elderly people (> 64 years of age) admitted to the hospital because of respiratory diseases.
Three-day moving averages of BC, PM, and their main tracer elements were used to estimate the effects on respiratory morbidity.
To confirm the univariate analyses, we fit a multivariate model to each response, using multiple tracer elements of previously defined pollution sources (Clarke et al.
To ensure that results were not sensitive to the element representing a particular source, we carried out sensitivity analyses in which models with alternative tracer elements were fit to the data.