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In contrast to a method such as Radiocarbon dating, which measures the disappearance of a substance, K-Ar dating measures the accumulation of Argon in a substance from the decomposition of potassium.

These scientists and many more after them discovered that atoms of uranium, radium and several other radioactive materials are unstable and disintegrate spontaneously and consistently forming atoms of different elements and emitting radiation, a form of energy in the process.By determining the number of tracks present on a polished surface of a grain and the amount of uranium present in the grain, it is possible to calculate how long it took to produce the number of tracks preserved.As long as the mineral has remained cool, near the earth surface, the tracks will accumulate.If the rock containing these minerals is heated, the tracks will begin to disappear.If the rock is heated high enough, 120C for apatite, all tracks will disappear.

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The original atom is referred to as the parent and the following decay products are referred to as the daughter.