Radioactive dating mass spectrometer My privatecam huli

16 Jul

Radioactive dating is a method of dating rocks and minerals using radioactive isotopes.This method is useful for igneous and metamorphic rocks, which cannot be dated by the stratigraphic correlation method used for sedimentary rocks. Some do not change with time and form stable isotopes (i.e.Another way of expressing this is the half-life period (given the symbol T).The half-life is the time it takes for half of the parent atoms to decay.The rate of decay (given the symbol λ) is the fraction of the 'parent' atoms that decay in unit time.For geological purposes, this is taken as one year.The Re-Os isotopic system was first developed in the early 1960s, but recently has been improved for accurate age determinations.The main limitation is that it only works on certain igneous rocks as most rocks have insufficient Re and Os or lack evolution of the isotopes.

The amount of carbon isotopes within living organisms reaches an equilibrium value, on death no more is taken up, and the 14C present starts to decay at a known rate.

Radioactive decay is a natural process and comes from the atomic nucleus becoming unstable and releasing bits and pieces.

These are released as radioactive particles (there are many types).

However, there is a limited range in Sm-Nd isotopes in many igneous rocks, although metamorphic rocks that contain the mineral garnet are useful as this mineral has a large range in Sm-Nd isotopes.

This technique also helps in determining the composition and evolution of the Earth's mantle and bodies in the universe.