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Libby later received the Nobel Prize in Chemistry in 1960: (From Taylor, 1987).Today, there are over 130 radiocarbon dating laboratories around the world producing radiocarbon assays for the scientific community.The C14 technique has been and continues to be applied and used in many, many different fields including hydrology, atmospheric science, oceanography, geology, palaeoclimatology, archaeology and biomedicine.There are three principal isotopes of carbon which occur naturally - C12, C13 (both stable) and C14 (unstable or radioactive).Desmond Clark (1979) wrote that were it not for radiocarbon dating, "we would still be foundering in a sea of imprecisions sometime bred of inspired guesswork but more often of imaginative speculation" (Clark, 1979:7).

Thus, one carbon 14 atom exists in nature for every 1,000,000,000,000 C12 atoms in living material.

As 14C decays it emits a weak beta particle (b ), or electron, which possesses an average energy of 160ke V.

The decay can be shown: Thus, the 14C decays back to 14N.

The 14C formed is rapidly oxidised to 14CO2 and enters the earth's plant and animal lifeways through photosynthesis and the food chain.

The rapidity of the dispersal of C14 into the atmosphere has been demonstrated by measurements of radioactive carbon produced from thermonuclear bomb testing.

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