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January 1974
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4 Reads
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18 Citations
Radiocarbon
On two previous occasions we have published lists of 14 C results of precisely dated wood samples in Radiocarbon as per mil deviations (R, 1965, v 7, p 179–186; R, 1969, v 11, no. 2, p 469–481). We have also published a list of 14 C dates, consolidating all dated wood samples processed in our lab to July 1969 (Ralph and Michael, 1970).
January 1973
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2 Reads
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2 Citations
January 1973
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14 Reads
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120 Citations
January 1972
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4 Reads
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30 Citations
... Two further samples were dated by the University of Pennsylvania laboratory in the mid-1970s (Fishman et al. 1977). These sediment samples were pre-treated in 3M HCl before conversion to carbon dioxide and measurement by gas proportional counting (Fergusson 1955;Ralph 1959;Michael and Ralph 1974). It is recorded that the humic fraction of P-2411 was dated (Johnston and Wailes 2007, 29). ...
January 1974
Radiocarbon
... The fact that Suess said he had drawn the curves with "cosmic schwung" to demonstrate the "most probable character" of the curve did not instil confidence (Adams 1973;Olsson 2009). Switsur (1973) compared the calibration tables presented by the University of Arizona (Damon et al. 1974) and the University of Pennsylvania (Ralph et al. 1974) at the 8th International Conference on Radiocarbon Dating at Lower Hutt City, New Zealand, and found that the difference in corrected ages was fairly small. He therefore provided calibration corrections from the averages of the Arizona and Pennsylvania measurements. ...
Reference:
EVOLUTION OF RADIOCARBON CALIBRATION
January 1973
... All radiocarbon determinations were made by the Institute of Nuclear Sciences, Department of Scientific and Industrial Research, Lower Hutt. Because age determinations have been made over a period of about 12 years during which time some refmements have been made in the method (Michael & Ralph 1972), those processed after 1973 are based on a 14C half life of 5730 ± 40 years. Earlier dating used a 5568 year half life. ...
January 1972
