What is radioactive dating of rock samples single international dating relation


14-Aug-2016 15:33

Measuring isotopes is particularly useful for dating igneous and some metamorphic rock, but not sedimentary rock.

Sedimentary rock is made of particles derived from other rocks, so measuring isotopes would date the original rock material, not the sediments they have ended up in.

This chain eventually ends with the formation of a stable, nonradioactive daughter nuclide.

Each step in such a chain is characterized by a distinct half-life.

In these cases, the half-life of interest in radiometric dating is usually the longest one in the chain.

This half-life will be the rate-limiting factor in the ultimate transformation of the radioactive nuclide into its stable daughter(s).

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It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.The final decay product, lead-208 (208Pb), is stable and can no longer undergo spontaneous radioactive decay.Systems that have been exploited for radiometric dating have half-lives ranging from only about 10 years (e.g., tritium) to over 100 billion years (e.g., Samarium-147).This predictability allows the relative abundances of related nuclides to be used as a clock to measure the time it takes for the parent atom to decay into the daughter atom(s).

Accurate radiometric dating generally requires that: is the decay constant of the parent isotope, equal to the inverse of the radioactive half-life of the parent isotope times the natural logarithm of 2. Calculate the mass of Cs-137 that will be left after 90 years. First half-life (30 years): 100 grams of Cs-137 decays and 50 grams are left.It is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and it can be used to date a wide range of natural and man-made materials.



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