Bomb radiocarbon dating

A shellfish alive today in a lake within a limestone catchment, for instance, will yield a radiocarbon date which is excessively old.

The reason for this anomaly is that the limestone, which is weathered and dissolved into bicarbonate, has no radioactive carbon.

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In general, only the information that you provide, or the choices you make while visiting a web site, can be stored in a cookie.The technique uses the discrete radiocarbon pulse in the environment caused by the detonation of nuclear bombs in the 1950s and 1960s as a "time stamp".Radiocarbon levels incorporated into the band pairs are measured and related to a reference chronology to determine the absolute age of a fish and can also be used to confirm or refute annual age in a species.For example, the site cannot determine your email name unless you choose to type it.Allowing a website to create a cookie does not give that or any other site access to the rest of your computer, and only the site that created the cookie can read it.

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