Now the curve extends tentatively to 50, years. This page was last edited on 23 Marchat This is the reverse of the way the curve is constructed: The presence of carbon in the isotopic signature of a sample of carbonaceous material possibly indicates its contamination by biogenic sources or the decay of radioactive material in surrounding geologic strata. Radiocarbon dating has transformed our understanding of the past 50, years.
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For example, it was once standard practice to simply burn whole bones, but the results were eventually seen to be unreliable. Measurement of Nthe number of 14 C atoms currently in the sample, allows the calculation of tthe age of the sample, using the equation above. The counters work by detecting flashes of light caused by the beta particles emitted by 14 C as they interact with a fluorescing agent added to the benzene. One of the frequent uses of the technique is to date organic remains from archaeological sites. Herbivores are less selective against the heavier isotopes, and their bone collagen is enriched by 5 parts per mil in relation to their diet.
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