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This result, while not eliminating the possibility that b ≠ 2, highlights its unimportance even in this high-precision application of radiocarbon dating.
Does inorganic carbon assimilation cause 14C depletion in deep-sea organisms?
Geochemical Modeling of the Madison Aquifer in Parts of Montana, Wyoming, and South Dakota.
Groundwater dating with radiocarbon: application to an aquifer under semi-arid conditions in the south of Morocco (Guelmime).
The errors in calculated ages which might arise from different b values are estimated and shown to be small relative to other dating uncertainties.
Two different trends can be seen in the tree ring series.
First, there is a long-term oscillation with a period of about 9,000 years, which causes radiocarbon dates to be older than true dates for the last 2,000 years and too young before that.
However, an analysis of published data reveals no meaningful correlation.
Reassessment of the 13 C/ 12 C and 14 C/ 12 C isotopic fractionation ratio and its impact on high-precision radiocarbon dating. A theoretical analysis suggests that b ≠ 2 effects may result in a correlation between age anomaly (C data.
The known fluctuations in the strength of the earth's magnetic field match up quite well with this oscillation: cosmic rays are deflected by magnetic fields, so when there is a weaker magnetic field, more production and an older apparent age.