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Isatope dating

The cumulative flux of cosmic rays at a particular location can be affected by several factors, including elevation, geomagnetic latitude, the varying intensity of the Earth's magnetic field, solar winds, and atmospheric shielding due to air pressure variations.Rates of nuclide production must be estimated in order to date a rock sample.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.

When one of these particles strikes an atom it can dislodge one or more protons and/or neutrons from that atom, producing a different element or a different isotope of the original element.Only in this way could Helium have become trapped in granites, Although Brennecka and his colleagues detected only a small difference in the Uranium isotopes within the same rock, this was enough to cast a measure of doubt on a procedure that has been deemed nearly infallible for many decades.And this dovetails with other valid research which has unearthed enough other data to call into question the assumed reliability of isotope clock dating systems.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..

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Using certain cosmogenic radionuclides, scientists can date how long a particular surface has been exposed, how long a certain piece of material has been buried, or how quickly a location or drainage basin is eroding.

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