【摘要】 微量样品的AMS14C年代测量具有十分重要的意义，特别是对于一些珍贵的考古样品或含碳量极少的地质样品尤其如此。近两年来，北京大学AMS研究小组对系统和测量方法进行了一系列的研究和改进工作。包括改进制样流程、提高离子源样品利用率、优化整个束线的传输和改进数据获取与处理系统。已成功地测量了一系列小于100μg的微量样品。更多还原

【Abstract】 It is important to improve the AMS 14C dating ability for small samples, especially for some precious archaeological samples or geological samples with small contentof carbon. A serles of improvements have been done in the recent two years. The difficultpoint for small samples is that some samples contain more sulphur but less carbon. Afterimproving the sample preparation process,the efficiency of removing sulphur and synthetizing graphite rises obviously. We redesigned the sample change mechanical structure, which provides more reliable samle change operation, rebuilt the injection controlsystem by using an IPC, replaced the data acquisition system,and optimized the transmission efficiency of the whole line. A batch of small samples have been dated in the pasttwo years as shown in table 2. Now the PKU AMS has the ability to measure sampleswhich is less than 100μg.更多还原