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Originally posted by peanutcd2005 at 2011-04-15 15:27:15:

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¦¤14C = 1000 x [ Fm *e^( -lambda * (CollectionYear-1950)) - 1 ]

e = 2.71828
lambda = 1/true half life of 14C = 1/8267 = 0.000121
Collection Year = year of death or exchange with biosphere ceased


¦¤14C value is defined by Stuiver and Pollach (1977) as the relative difference between the absolute international standard (base year 1950) and sample activity corrected for age and ¦Ä13C. The ¦¤14C is age corrected to account for decay that took place between collection (or death) and the time of measurement so that two measurements of the same sample made years apart will produce the same calculated ¦¤14C result.


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