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0Â ÃŽÂ¼ci) carbon-14 is fed to a patient (i.
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Carbon-12 and carbon-13 are both stable, while the half-life of carbon-14 is 5,730Ã‚Â±40 years.
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In the borexino counting test facility, a 14c/ âˆ’18 was determined; 14c in different petroleum reservoirs, and the lower 14c levels in methane, have been discussed by bonvicini et al.
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Carbon-14 can be used as a radioactive tracer in medicine.
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In connection with building the borexino solar neutrino observatory, petroleum feedstock (for synthesizing the primary scintillant) was obtained with low 14c content.
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Liquid scintillation counting is the preferred method.
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For the dating technique, see radiocarbon dating.
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However, open-air nuclear testing between 1955â€“1980 contributed to this pool 14 and 19 year old dating.
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 the atmospheric half-life for removal of 14co 2 has been estimated to be roughly 12 to 16 years in the northern hemisphere.
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One of the frequent uses of the technique is to date organic remains from archaeological sites.
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 the following inventory of carbon-14 has been given: 14c is greatly depleted.
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The presence of carbon-14 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.