Results 101 to 110 of about 22,327 (143)
Multi-Country Study of Stable Isotopes and Mineral Elements in European Pork. [PDF]
FoodsPinna A +14 more
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Optimisation of A Sample Preparation Method for the Determination of Multi-Elemental Compositions in Human Hair By Triple Quadrupole ICP-MS Analysis. [PDF]
Biol Trace Elem ResRunkel AA +5 more
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[Establishment of a Noninvasive Diagnostic Model for Wilson Disease Using Metallomics and Machine Learning]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanZhou H +6 more
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Depth and Seasonality of Soil Respiration in <i>Caragana korshinskii</i> Plantation on the Loess Plateau. [PDF]
Plants (Basel)Sun Y, Chen Y.
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2013 IEEE Aerospace Conference, 2013
This paper reports on the first rubidium-strontium (Rb-Sr) radiometric dates using a Laser Desorption Resonance Ionization Mass Spectrometry (LDRIMS) instrument capable of being miniaturized for flight to another planet. The LDRIMS instrument produces dates in under 24 hours, requires minimal sample preparation, and avoids the interference and mass ...
F. S. Anderson, K. Nowicki, T. Whitaker
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This paper reports on the first rubidium-strontium (Rb-Sr) radiometric dates using a Laser Desorption Resonance Ionization Mass Spectrometry (LDRIMS) instrument capable of being miniaturized for flight to another planet. The LDRIMS instrument produces dates in under 24 hours, requires minimal sample preparation, and avoids the interference and mass ...
F. S. Anderson, K. Nowicki, T. Whitaker
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Rb-Sr ages and elemental abundances of K, Rb, Sr, and Ba in samples from the Ocean of Storms
Geochimica et Cosmochimica Acta, 1971Abstract Rb-Sr internal isochron ages for three basaltic crystalline rocks from the Ocean of Storms are 300–600 m.y. younger than the ages of basaltic rocks from the Sea of Tranquillity. Rock 12063 has an age of 3.34 ± 0.10AE and [ 87 Sr 86 Sr ]I of 0.69914 ± 3. Internal isochron ages of two separate samples of rock 12004 yield ages of
V.Rama Murthy +3 more
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A Rb-Sr ISOCHRON FOR THE SHAP GRANITE
Proceedings of the Yorkshire Geological Society, 1978SUMMARY A Rb-Sr age of 394 ± 3 Ma has been determined from a 21–point isochron for the Shap Granite, which was probably emplaced in lower Devonian times. The determination provides a minimum age for the base of the Gedinnian Stage. K-Ar measurements on biotites and U-Pb measurements on zircons from the granite give similar ages.
A. J. WADGE +3 more
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Geochimica et Cosmochimica Acta, 1973
Abstract Becalibration of ‘spikes’ using stoichiometric Rb and Sr salts recently issued by the National Bureau of Standards shows that our determinations of the ratio 87 Rb 86 Sr in lunar samples have been low by 1.8 per cent, which we attribute to non-stoichiometry of the salts previously used for calibration, particularly RbCl.
J.R De Laeter, M.J Vernon, W Compston
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Abstract Becalibration of ‘spikes’ using stoichiometric Rb and Sr salts recently issued by the National Bureau of Standards shows that our determinations of the ratio 87 Rb 86 Sr in lunar samples have been low by 1.8 per cent, which we attribute to non-stoichiometry of the salts previously used for calibration, particularly RbCl.
J.R De Laeter, M.J Vernon, W Compston
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Precision KRbSr isotopic analysis: Application to RbSr chronology
Chemical Geology, 1986Abstract A new ion-exchange separation procedure is described for the isolation of Sr from Ca. It has been designed to give reproducible results with only approximately known reagent concentrations. Evaporation during storage is not critical and may easily be checked with a common pH paper. The medium is buffered by pyridine in the range pH 5–6. The
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The statistical assessment of Rb-Sr isochrons
Journal of Geophysical Research, 1966The variance in isotope-dilution measurements of Rb87/Sr86in geological samples is shown to be proportional in general to (Rb87/Sr86)2, so that simple regression methods for estimating Rb-Sr isochrons are not formally valid. A new regression method which allows for known experimental error in both Sr87/Sr86 and Rb87/Sr86 and which weights the data to ...
G. A. McIntyre +3 more
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