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Think of air bubbles frozen in an ice cube--the air is prevented from escaping by the solid ice, but will escape when the cube melts because the energy of the system is lower without the bubbles.(Further separation could occur during solidification, due to different crystallizations of the parent and daughter isotopes.) This means that the information about how much decay took place prior to melting is lost.As a result, there is a changing ratio of carbon-14 to the more atomically stable carbon-12 involves actually counting individual carbon-14 atoms.This allows the dating of much older and smaller samples but at a far higher cost.In this period a number of comprehensive cosmogonies were proposed.These were long on armchair speculation and short on substantive supporting evidence.

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The recent news article on a meteorite that originated on the moon was able to list the major impact events it experienced while on the moon, and to date them.Although, organic materials as old as 100,000 years potentially can be dated with AMS, dates older than 60,000 years are still rare.Paleoanthropologists and archaeologists must always be aware of possible radiocarbon sample contamination that could result in inaccurate dates.In the liquid or gaseous state, however, particles can move around and boil off.Because of radioactive decay, the material starts out with a larger amount of daughter isotope than is chemically favorable, so some of it will escape to bring the material to equilibrium.by Tas Walker A geologist works out the relative age of a rock by carefully studying where the rock is found in the field.