Studies using radiometric dating best pictures to post on dating sites
(Creationists claim that argon escape renders age determinations invalid.
However, any escaping argon gas would lead to a determined age younger, not older, than actual.
Thus, although "extinct", these nuclides are present in meteorites, but produced by a more recent process.
"The idea that Rb-Sr is the most used chronometer for meteorites is largely based on work done 10-30 years ago.
These ions are accelerated in an electric field through collimating slits and subject to a magnetic field which causes the ions to follow a curved path. By adjustment of the strength of the magnetic field and suitable placement of an ion collector, the different isotopes can be measured with precision.
There are some things that affect these measurements.
Increasingly, the other techniques are used, such that probably no one technique dominates for meteorite dating.
For example, uranium-238 is an isotope of uranium-235, because it has 3 more neutrons in the nucleus.Simply counting the number of rings will give one a fairly good idea of the age of the tree.Periods of heavy rain and lots of sunshine will make larger gaps of growth in the rings, while periods of drought might make it difficult to count individual rings. When a given quantity of an isotope is created (in a supernovae, for example), after the half-life has expired, 50% of the parent isotope will have decomposed into daughter isotopes.The sum of protons plus neutrons is the mass number.We designate a specific group of atoms by using the term "nuclide." A nuclide refers to a group of atoms with specified atomic number and mass number.