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Petrology Tulane University Prof. Stephen A. Nelson Radiometric Dating Prior en route for the best and most acknowledged age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Globe to cool to its today temperature from a completely bright state.
Although we now ratify lots of problems with with the purpose of calculation, the age of 25 my was accepted by maximum physicists, but considered too wanting by most geologists.
Then, popular , radioactivity was discovered. Credit that radioactive decay of atoms occurs in the Earth was important in two respects: It provided another source of cook, not considered by Kelvin, which would mean that the cooling time would have to be much longer.
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Because the radioactive half-life of a given radioisotope is not affected by temperature, physical or chemical state, or any other influence of the environment outside the nucleus save direct particle interactions with the nucleus, then radioactive samples continue to decay at a predictable rate and can be used as a clock. This makes several types of radioactive dating feasible. For geologic dating, where the time span is on the order of the age of the earth and the methods use the clocks in the rocks , there are two main uncertainties in the dating process:.