Estimation of birth year by radiocarbon dating of tooth enamel: Approach to obtaining enamel powder
Estimation of birth year by radiocarbon dating of tooth enamel: Approach to obtaining enamel powder
复制标题
通过牙釉质放射性碳测年法推算出生年份：获取牙釉质粉末的方法
DOI：
10.1016/j.jflm.2019.01.013
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发表时间：
2019
影响因子：
1.5
通讯作者：
Tokanai Fuyuki
中科院分区：
文献类型：
--
作者：
Saitoh Hisako;Moriya Toru;Takeyama Mirei;Yusa Kazuyuki;Sakuma Ayaka;Chiba Fumiko;Torimitsu Suguru;Ishii Namiko;Sakurada Koichi;Iino Mitsuyoshi;Iwase Hirotaro;Tokanai Fuyuki
1955年至1963年，由于大气核武器试验，大气放射性碳（14 C）水平上升，然后下降。由于14 C在牙釉质形成的过程中积累在牙釉质中，因此14 C可以用来估计身份不明的人的出生年份。使用加速器质谱法测量牙釉质中14 C含量的结果因牙釉质样品位置而异。为了解决这个问题，在本研究中考虑了使用粉碎机均衡样品的方法。关于用作粉碎机的管和锥，比较（1）聚碳酸酯管和不锈钢锥，（2）不锈钢管和锥，和（3）碳化钨管和锥。在（1）中，现代碳比约为100 pMC正常碳比的一半，无法进行准确的年代测定，在（2）中，IAEA-C1的背景值很高，使用可重复使用的管和锥将其粉碎。在（3）中，使用可重复使用的管和锥粉碎并用石英砂洗涤的IAEA-C1的14 C含量为0.31 ± 0.01 pMC。该结果没有显示出任何关于背景值的问题。因此，建议使用碳化钨制品和用石英砂冲洗进行14 C测量。
Atmospheric radiocarbon (14C) levels increased from 1955 to 1963 due to atmospheric nuclear weapon tests, and then decreased. As14C accumulates in human tooth enamel while the enamel is being formed,14C can be used to estimate the birth year of unidentified bodies. Measurement results of14C content in tooth enamel using accelerator mass spectrometry vary depending on the enamel's sample site. To address this problem, a method for equalizing samples using a pulverizer was considered in this study. Regarding the tube and cone used as the pulverizer, (1) a polycarbonate tube and stainless steel cone, (2) a stainless steel tube and cone, and (3) a tungsten carbide tube and cone, were compared. In (1), the modern carbon ratio was approximately half that of the normal ratio of 100 pMC, with which accurate dating was impossible, and in (2), a high background value was obtained for IAEA-C1, which was pulverized using a reusable tube and cone. In (3), the14C content for IAEA-C1 pulverized using reusable tube and cone, which was washed with quartz sand, was 0.31 ± 0.01 pMC. This result did not show any problems regarding background value. Therefore, the use of tungsten carbide products and washing with quartz sand is recommended for14C measurement of pulverized teeth.