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iriver595t

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为什么要写成Δ14C，而不像δ13C写成δ14C，难道是因为14C是放射性的？

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xuliforever(金币+1): 欢迎常来地学版交流。。 2011-04-16 22:22:00

Δ14C = 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

Δ14C 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 δ13C. The Δ14C 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 Δ14C result.

ls原谅这些无知无畏的国内的年轻人吧:-)

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[ Last edited by risewithsu on 2011-4-16 at 01:57 ]