It disintegrates at a measured rate into calcium and argon.Similarly, the radioactive element uranium decomposes into lead and some other elements.
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Two of the most widely-known systems are the potassium-argon method and the uranium-lead method.
A radioactive form of potassium is found in minute quantities in some rocks.
The speed of the disintegration process is measured.
A portion of the material is ground up and a measurement is made of the ratio of radioactive “parent” atoms to the decomposition products.
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