All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.
This age was based on the belief that the rate of decay has been constant, and that Uranium 238 will be present in a known ratio to Uranium 235.
The varying quantities of these isotopes call into question the calculated age of the solar system, since “one of the equation’s assumptions — that certain kinds of uranium always appear in the same relative quantities in meteorites — is wrong.” CAIs are “calcium-aluminum-rich inclusions” found in the meteorite.
Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.
The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.
Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.
By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.
Gregory Brennecka of Arizona State University and colleagues measured the relative amounts of Uranium 238 to Uranium 235 from several samples taken from the large Allende meteorite, named for the village in Mexico near where it landed in 1969.
With the more sensitive instrument, they detected small differences in isotope ratios from different inclusions within the same meteorite..
C) dating usually want to know about the radiometric dating methods that are claimed to give millions and billions of years—carbon dating can only give thousands of years.