Radiocarbon dating before 1950

The graph below is a plot of 2004 tree ring data points (blue dots) used to date the VM.The y-axis is the measured BP age and the x-axis is the calculated BP age (x = 1950 - tree ring age) in 5-year intervals(III). The measured BP age ranges from 646 to 415 (231) years is condensed to 70 years (570-500).The new method is based on the fact that over the past 60 years, environmental levels of radiocarbon have been significantly perturbed by mid-20th-century episodes of above-ground nuclear weapons testing.

In 1979, Desmond Clark said of the method “we would still be foundering in a sea of imprecisions sometime bred of inspired guesswork but more often of imaginative speculation” (3).It indicates the date when the parchment was made, but not the date when the VM was written.I have written two previous articles on statistics and the interpretation of results obtained from AMS measurements of C BP years to AD years using the tree ring curve.The slope of the measured tree ring curve is approximately linear with a gradient of ~3, the black line has a gradient of 1.The AMS radiocarbon dating procedure uses milligram samples of parchment that are subjected to a complex series of washing chemical reactions and finally the differential analysis of three carbon isotopes using the AMS mass spectrometer.One of the biggest factors in throwing off carbon dates is the fact that nuclear testing, which began around 1950, “blasted out radiation [into the atmosphere] that scientists see clearly as a spike in the radiocarbon record” (ibid.).


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