lead isotopesの例文

• Lead isotope geochemistry is useful for providing isotopic dates on a variety of materials.
• Thus, deposits formed in different geological period would have various lead isotope signature.
• Lead isotope analyses have been interpreted as documenting crystallization of carbonados about 3 billion years ago.
• Except 204 Pb, other lead isotopes are products of radioactive decay of uranium and thorium.
• Strontium and lead isotopes can be used to understand population movements, like migration and seasonal mobility.
• In 1953, Clair Cameron Patterson measured ratios of the lead isotopes in samples of the meteorite.
• Interpretation of lead isotope data is, however, often contentious and faces numerous instrumental and methodological challenges.
• An examination of lead isotopes similar to the one used on the silver was employed for the tin.
• Lead isotope isochron diagram used by C . C . Patterson to determine the age of the Earth in 1956.
• Its lead isotope composition is different from the composition of that segment of the Andes, being non-radiogenic.
• Additionally, 47 nuclear isomers ( long-lived excited nuclear states ), of 24 lead isotopes, have been characterized.
• These differences were considered to be an exception attributed to lead isotopes being products of the natural radioactive decay chains of uranium.
• The lead isotope ratios are consistent with the volcano having formed at the edge of an area of granite and rhyolite of Paleozoic age.
• Thompson, in her analyses of the hacksilver pieces, relates this textual evidence to lead isotope ratios that have ore signatures matching Sardinian ores.
• Lead isotope ratios are comparable with these of Galan and La Pacana and are linked to the domain of the crust they are constructed on.
• In the United States he researched nuclear reactions using a cyclotron and discovered a radioactive lead isotope with Voigt, and a new rhenium isotope with Sullivan.
• Particularly in the Bronze Age Mediterranean, lead isotope analysis has been a useful tool for determining the sources of metals and an important indicator of trade patterns.
• The concept of common Pb-Pb dating ( also referred to as whole rock lead isotope dating ) was deduced through mathematical manipulation of the above equations.
• These fission tracks inevitably act as conduits deep within the crystal, thereby providing a method of transport to facilitate the leaching of lead isotopes from the zircon crystal.
• Patterson isolated lead from fragments of a meteorite that had struck Earth thousands of years ago, and determined the age of the fragments by analyzing proportions of the lead isotopes.