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用电子自旋共振方法考察了动物牙化石样品测年信号的来源和性质．通过与纯物质的比较和使用正电子湮没技术进行的研究表明牙化石珐琅样品顺磁中心是由ＰＯ３－４子产生的Ｆ中心所形成．
Electron spin resonance method was used to investigate the origin and properties of the dating signal from animal fossil samples. A comparison with pure matter and studies using positron annihilation showed that the paramagnetic center of the dental fossil enamel is formed by the F center of PO3-4.