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报道了第二批鹿牙样品的测年结果。采用新近发展的非线性拟合外推法获得样品的累积剂量。应用适合于牙釉质层样品的剂量率公式,计算了四种铀吸收模式的ESR年龄及其误差,得出了北京猿人遗址含有北京猿人头盖骨地层的年代分别为:第11层575±101ka,第8—9层409±72ka,第6—7层365±64ka和第3层290±51ka。
Reported the second batch of deer teeth sample dating results. The cumulative dose of the sample was obtained using a newly developed nonlinear fit extrapolation. Applying the dose rate formula suitable for the enamel layer samples, the ESR ages and their errors of the four uranium absorption modes were calculated. The results showed that the Peking Man Site contains Peking Skulls with the ages of 575 ± 101 ka, 409 ± 72 ka in the 8-9 layer, 365 ± 64 ka in the 6-7 layer and 290 ± 51 ka in the third layer.