论文部分内容阅读
热电离质谱法可用比经典的α能谱法少一个数量级的样品,实现高一个数量级的测量精度。本文报道了用这一新技术测定北京猿人遗址1-2层钙板样BZC-3的铀系年代。据四次平行分析的加权平均值,该样应为41±1万年,代表了北京猿人五号头骨的最小年龄。四次分析(样品未混匀)的结果在误差范围内一致、α能谱二种铀系法结果一致及加速器质谱法未能检出-(14)C,表明样品有较好的封闭性。本文结果不支持亚洲直立人演化较慢和中国有二种人类(晚期直立人与早期智人)并存的假说。
Thermal ionization mass spectrometry can be an order of magnitude less than the classical alpha spectrometry samples, to achieve an order of magnitude higher accuracy. This paper reports the determination of the uranium age of the calcium apatite BZC-3 layer 1-2 of Peking Man Site by this new technique. According to the four parallel analysis of the weighted average, the sample should be 41 ± 1 million years, representing the Peking Man fifth skull minimum age. The results of the four analyzes (the sample is not well-mixed) are consistent within the error range. The results of the two uranium series of α energy spectra are consistent and the accelerator mass spectrometry failed to detect the value of - (14) C, indicating that the sample has better sealing property. The results in this paper do not support the hypothesis that Asian Homo erectus evolved slowly and that there were two kinds of human beings in China, Late Homo erectus and Early Homo sapiens.