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Data on the combined state sales tax rate and average local sales tax rate for each state came from the Tax Foundation and were given a one-tenth weighting.Data on state spirit tax, wine tax, and beer tax in dollars per gallon also came from the Tax Foundation and were each given a one-tenth weight. Os cannot be resolved by mass spectrometry, and chemical separation of these isotopes is comparatively difficult.Additionally, decoupling of Re and Os within molybdenite crystals has been reported, especially in older and coarser grains, which means that extra care has been urged in sample preparation (Selby and Creaser ).Analysis of pressed particulate pellets of natural molybdenite was used to assess the protocol with respect to detection limits and precision and accuracy of Re-Os ratios.Finally, the analytical protocol was tested on natural molybdenite crystals from a range of geological settings and ages.), and optimization for Re-Os analysis was performed by line or spot analysis of NIST SRM 610, AI-3, and Moly Hill pressed pellet (see below).Consumer price indices for the cost of food away from home and for recreation by region — Northeast, South, West, and Midwest — are unadjusted figures from the Bureau of Labor Statistics and were given a half-weight. Commute time and the average price of a regular gallon of gasoline from AAA as of Aug.Data on the mean travel time to work is from the U. 6, 2019 were combined into a product and given double weight.
With the introduction of ICP tandem mass spectrometry (MS/MS), it has become possible to control a range of isobaric interferences previously out of reach of quadrupole ICP-MS (Bolea-Fernandez et al. Effective separation is possible because the daughter isotope reacts with a reaction gas and is measured in the so-called mass-shift mode, while the parent isotope does not react and is measured on-mass.
The same principle can potentially also be applied to the Re-Os system, since methane (CHOs ratios in molybdenite.
In the absence of accessible Re-Os standards, homogeneous in both Re and Os, new reference material need to be developed to enable in situ Re-Os dating.
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