First, the calibration curve provides a reliable way to calculate the uncertainty of the concentration calculated from the calibration curve ( using the statistics of the least squares line fit to the data ).
42.
If standards of a known size are run previously, then a calibration curve can be created to determine the sizes of polymer molecules of interest in the solvent chosen for analysis ( often THF ).
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Many theoretical relationships, such as fluorescence, require the determination of an instrumental constant anyway, by analysis of one or more reference standards; a calibration curve is a convenient extension of this approach.
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The resulting data, in the form of a calibration curve, is used to convert a given measurement of radiocarbon in a sample into an estimate of the actual calendar age of that sample ."
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Libby s value for the half-life is used to maintain consistency with early radiocarbon testing results; calibration curves include a correction for this, so the accuracy of final reported calendar ages is assured.
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Biosensors can be used to indirectly measure BOD via a fast ( usually < 30 min ) to be determined BOD substitute and a corresponding calibration curve method ( pioneered by Karube et al ., 1977 ).
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In the mid-1980s he led the development of the first high precision radiocarbon calibration curve extending back nearly 10, 000 years ago based on 14 C measurements of tree-rings with known calendar ages from dendrochronology.
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The resulting curve can then be matched to the actual calibration curve by identifying where, in the range suggested by the radiocarbon dates, the wiggles in the calibration curve best match the wiggles in the curve of sample dates.
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The resulting curve can then be matched to the actual calibration curve by identifying where, in the range suggested by the radiocarbon dates, the wiggles in the calibration curve best match the wiggles in the curve of sample dates.
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:: 1 ) the way the graph is read and used is the opposite direction from the way it was created by scientists, and that the " fat grey line " " is " the calibration curve, and
