method should be applicable to most stone and stony-iron meteorites. 1967 American Physical Society. Voit halutessasi lopettaa jäsenyytesi ja poistaa profiilisi sivulla "Tili ja tilaukset".
We present successful 81Kr-Kr radiometric dating of ancient polar ice.
Krypton was extracted from the air bubbles in four 350-kg polar ice.
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Conventional MS is unable to distinguish such rare isotopes from the overwhelming neighboring masses, and even resonance ionization MS (rims) requires isotope enrichment to lift the 81Kr/Kr ratio to a measurable level ( 7 ). For applications of 81Kr dating in groundwater, sample size is less of a restriction, and several studies in large aquifer systems are currently in progress ( 5 ). In pnas, Buizert. However, traditional tandem accelerators cannot be used for noble gases, which do not form stable negative ions ( 9 ). In addition to the ice cores, which are limited in number and amount of ice, old ice is accessible in abundance at locations near ice sheet margins and in so-called blue ice areas, where old ice upwells, whereas accumulation of snow is prevented. So-called horizontal ice cores from blue ice areas lack the obvious stratigraphy of vertical ice cores, which makes the availability of an independent dating tool even more important. The ice samples from the Taylor glacier weighed about 350 kg ( 1 which is far above any reasonable limit for ice cores. Atta can also be used to detect other radioisotopes, such as 41Ca ( 15 ) and in particular 39Ar ( 16, 17 which has the same advantages as 81Kr but covers a different age range with its shorter half-life of 269 y ( Table. At present, sample sizes on the order of 1,000 L of water are required for such an analysis, but in principle, a reduction to only a few liters should be possible ( 20 ).
An overview of the atta effort is provided under Laboratory for Radiokrypton Datin.
Sample size required for 81Kr dating: 10 micro-liter STP of krypton gas.
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Analyses for 81Kr and noble gases on groundwater from the deepest aquifer system of the Baltic Artesian Basin (BAB) were performed.
AND THE possibility OF Kr-Kr dating.
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