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An event like metamorphism could heat the crystal to the point where Pb will become mobile.

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Although we now recognize lots of problems with that calculation, the age of 25 my was accepted by most physicists, but considered too short by most geologists. Recognition that radioactive decay of atoms occurs in the Earth was important in two respects: Principles of Radiometric Dating Radioactive decay is described in terms of the probability that a constituent particle of the nucleus of an atom will escape through the potential (Energy) barrier which bonds them to the nucleus.The first method was based on radioactive elements whose property of decay occurs at a constant rate, known as the half-life of the isotope.



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