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Working with several collaboraters, Libby established the natural occurrence of radiocarbon by detecting its radioactivity in methane from the Baltimore sewer.

In contrast, methane made from petroleum products had no measurable radioactivity.

OCR is claimed to have been calibrated against radiocarbon and historically dated features, from which an equation relating OCR to calendar age (see below) has been derived. These two procedures are commonly used in soil analysis to characterize the organic carbon content in agricultural soils.

S Burr Oxidizable Carbon Ratio (OCR) dating is claimed by its inventor to be "an independent dating procedure. The extent of these changes is measured by the Oxidizable Carbon Ratio, which is defined as the ratio of organic carbon determined by a wet oxidation procedure to total organic carbon, as measured by a low-temperature loss on ignition procedure (Frink 1992, 1994, 1995, 1997). Black 1935 An Examination of the Degtjareff Method for Determining Soil Organic Matter, and a Proposed Modification of the Chromic Acid Titration Method. In graduate school, I analyzed archaeological soil features using various soil analytic techniques including the Ball, Loss-on-Ignition, and Walkley-Black wet oxidation procedures.

In contrast, from 1955 to 1963, atmospheric radiocarbon levels almost doubled.

Since then they have been dropping back toward natural levels.

Before the nuclear age, the amount of radiocarbon in the environment varied little in the span of a century.This discovery meant that there are three naturally occurring isotopes of carbon: Whereas carbon-12 and carbon-13 are stable isotopes, carbon-14 is unstable or radioactive.Carbon-14 is produced in the upper atmosphere when cosmic rays bombard nitrogen atoms.Compared to conventional radiocarbon techniques such as Libby's solid carbon counting, the gas counting method popular in the mid-1950s, or liquid scintillation (LS) counting, AMS permitted the dating of much smaller sized samples with even greater precision.Regardless of the particular 14C technique used, the value of this tool for archaeology has clearly been appreciated.

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