石笋样品的电子自旋共振特性研究

Study on ESR characterization of stalagmites

采用广西、福建等地的10个天然石笋样品，研究了其顺磁缺陷的种类，各电子自旋共振（ES）信号对辐照剂量的不同反应，以及研磨效应对测年的影响等ESR特性，并确定g=2．0007的信号适于选作测年用的信号。

Ten stalagmite samples from Guangxi and Fujian of south China have been studied and their paramagnetic defects and the complex ESR signals have been researched. For each ESR signal, the response to radiation dose was different. The responses of two signals (g=2.0007 and g=2.0023) were found more sensitive. The mean life of signal g=2.0023 was only 4.8 years at 20℃, but that of the signal g=2.0007 was about 105 years, therefore the signal g=2.0007 can be chosen for ESR dating. The effect of sa-mple's grinding on the dating was also discussed.