The following list comprises age measurements carried out during 1976 and 1977. The activity of14C was computed by one- and two-channel scintillation devices (Punninget al, 1976; 1977). Ages are calculated using a half-life of 5568 ± 30 years for14G with NBC oxalic acid as a reference standard. All dates are reported in years before 1950.12C/13C measurements were not performed and results are not corrected for13C fractionation.
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Punning et al. (1978) studied this question.
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