The ion probe allows the elemental and isotopic analysis of small samples and even measurements of many different spots on a given crystal.
Radiometric dating of meteorites from another solar system patricia clarkson who is she dating
The second was that the radioactive decay of Al, together with other short-lived radioisotopes, had been produced by nuclear processes (nucleosynthesis) in stars prior to the collapse of the nebular cloud giving birth to our solar system.
Other primitive objects from meteorites such as chondrules show initial and smaller.
Furthermore, uranium is the only clock based on long-lived isotopes that has a precision (less than a million years) that allows the resolution of different events in the early solar system.
Because lead isotopes are the daughter products of uranium decay, uranium ages are usually called Pb-Pb ages.
Although this is so short that all of it has decayed billions of years ago, its presence at the beginning of the solar system has been conclusively established by the discovery of excesses of its daughter isotope Magnesium isotopic ratios measured in different minerals with different ratios of aluminum to magnesium from a refractory inclusion in the meteorite Allende [Data link].
Mg, a stable isotope, with a half-life of 0.73 million years.
This bombardment could, in principle, also have produced other short-lived isotopes including Al is that the uranium half-lives are long enough that these isotopes are still around today.
As a consequence, absolute ages can be measured by the uranium clock, while only relative ages can be determined with the Al clock.
This has generally been interpreted as indicating that chondrules formed approximately 2 million years after CAIs.
However, it could also have meant that chondrules formed at the same time as CAIs but were endowed with less Al was uniformly distributed.
This picture shows the recently installed Nano SIMS at Washington University.