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In the original research, done in the 1940’s, the radiocarbon method of age determination was found to have furnished approximate results: the tolerances ranged from ±150 to ±450 years (Arnold and Libby, 1949).

Since the dates of the Egyptian pharaohs determined by the radiocarbon method matched the expected dates well enough, Arnold and Libby concluded that ”the two basic assumptions of the radiocarbon age determination method – namely, the constancy of the cosmic radiation intensity and the possibility of obtaining unaltered samples – are probably justified for wood up to 4600 years”.

Tree ring dating has been used to construct a probabilistic calibration curve extending back to 11857 calendar years BP (see figure below).

This method is not without its own inaccuracies and has limited precision, but it does provide dates in terms of calendar years.

Suitable material includes molluscs, microfossils and wood from terrestrial, non-marine and marine environments.

C dating have traditionally been quoted in “conventional radiocarbon years”, typically in years BP (before present) where the “present” is 1950.

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The linkage of the raw radiocarbon lab data to the known age of the samples could only be ascertained with the unsealing of the double-blind document.

Arnold and Libby’s two basic assumptions, however, are incompatible with the highly precise results researchers aim to realize nowadays. Further, the availability of unaltered samples appears unrealistic, since extraneous inclusions often contaminate the samples and they must be treated prior to testing.

The Results The draft article: Sturt Manning, 2012.

Manning's Cornell test served as a trial run of the double-blind procedure intended to resolve the inconsistencies of earlier research.

The method proved workable and can be employed in future tests.

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