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Radiocarbon decays slowly in a living organism, and the amount lost is continually replenished as long as the organism takes in air or food.Once the organism dies, however, it ceases to absorb carbon-14, so that the amount of the radiocarbon in its tissues steadily decreases.The key is to measure an isotope that has had time to decay a measurable amount, but not so much as to only leave a trace remaining.Given isotopes are useful for dating over a range from a fraction of their half life to about four or five times their half life.Dating the particles which make up the rock wouldn’t give you the age of the rock itself.In addition, the redeposition process upsets the conditions necessary to achieve accurate results through radiometric dating.Symbolically, the process of radioactive decay can be expressed by the following differential equation, where N is the quantity of decaying nuclei and k is a positive number called the exponential decay constant.

There are over forty such techniques, each using a different radioactive element or a different way of measuring them.This technique is generally used to date igneous and metamorphic rock, which are rocks that were once melted due to extreme heat and pressure.Radiometric dating determines how long ago the liquid rock solidified into solid rock.It has become increasingly clear that these radiometric dating techniques agree with each other and as a whole, present a coherent picture in which the Earth was created a very long time ago.Further evidence comes from the complete agreement between radiometric dates and other dating methods such as counting tree rings or glacier ice core layers.explains: “Carbon-14 dating, also called radiocarbon dating, [is a] method of age determination that depends upon the decay to nitrogen of radiocarbon (carbon-14).