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The theory is that when zircons crystallize they lose all of their lead and as long as the crystal remains closed its lead/uranium ratios should follow a predictable trend.It is further theorized that since all isotopes of the same element are chemically identical, they should be removed in proportional amounts, forming a straight line on the concordia diagram, that crosses the concordia curve at both the crystallization and the contamination date.Absolute dating is a dating method that allows the assignment of a specific date to an archaeological or palaeontological site or artifact.

Palm Reading: A Little Guide To Life's Secrets (Miniature Edition) by Julie Paschkis 22.The rate of decay is conveniently expressed in terms of an isotope's half-life, or the time it takes for one-half of a particular radioactive isotope in a sample to decay.Most radioactive isotopes have rapid rates of decay (that is, short half-lives) and lose their radioactivity within a few days or years.By 1905, the British physicist Lord Rutherford made the first clear suggestion for using radioactivity as a tool for measuring geologic time directly; shortly thereafter, in 1907, Professor B. Boltwood, radiochemist of Yale Uniyersity, published a list of geologic ages based on radioactivity.Although Boltwood's ages have since been revised, they did show correctly that the duration of geologic time would be measured in terms of hundreds-to-thousands of millions of years.

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