Sex chat for ipod - Explain potassium 40 dating

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In fact, Argon-Argon is a method to confirm the results of the K-Ar results by verifying how much Atomspheric argon was initially in the rock when it cooled, or if the rock has been reheated and "reset".

Radioactive dating is a process for determining the age of an object by measuring the amount of a given radioactive material it contains.

The best known example of radioactive dating employs carbon 14, a radioactive isotope of carbon.

Potassium-argon or K-Ar dating is a method used by archaeologists and geologists to ascertain the date of ancient mineral deposits.

The potassium isotope K40 decays to argon40 with a half-life of 1,300,000,000 years.

As argon is a gas any traces of that element will escape from rocks only when they are molten.Therefore, any argon found in solid rocks must have been produced since that molten state ended and the rock solidified.The ratio of K40 to A40 can be analysed and a numerical date since the last molten state can be assigned.There are various other radiometric dating methods used today to give ages of millions or billions of years for rocks.These techniques, unlike carbon dating, mostly use the relative concentrations of parent and daughter products in radioactive decay chains.For example, potassium-40 decays to argon-40; uranium-238 decays to lead-206 via other elements like radium; uranium-235 decays to lead-207; rubidium-87 decays to strontium-87; etc.

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