加速器质谱^(14)C样品制备中Zn-TiH_2法石墨产率探讨  

Discussion on the Graphite Yield of Zn-TiH_2 Method in the Preparation of Accelerator Mass Spectrometry ^(14)C Sample

作　　者：徐超 洪冰[1] 彭海军[1] 丁寒维 洪业汤[1] 朱詠煊[1] XU Chao;HONG Bing;PENG Haijun;DING Hanwei;HONG Yetang;ZHU Yongxuan(Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 101408,China)

机构地区：[1]中国科学院地球化学研究所,贵州贵阳550081 [2]中国科学院大学,北京101408

出　　处：《同位素》2018年第4期248-255,共8页Journal of Isotopes

基　　金：国家自然科学基金项目(41373134;40231007)

摘　　要：用于加速器质谱仪(accelerator mass spectrometry,AMS)测定14 C年龄的石墨靶制备方法有很多种,提高石墨产率对优化石墨靶制备流程和改善石墨靶性能具有重要意义。本文以Zn-TiH2法制备石墨靶为例,结合相关研究,证明石墨产率与同位素分馏之间的关系;对比石墨产率的不同测算方法并提出改进建议;对实验过程中影响石墨产率的因素进行探讨,对Zn-TiH2法制备石墨靶的最优实验条件进行简要总结。There are many kinds of methods for preparing graphite target for 14C dating by accelerator mass spectrometer（AMS）.Increasing the yield of graphite is of great significance for optimizing the preparation processes of graphite target and improving the performance of graphite target.In this paper,the studies relating to the graphite target preparation by Zn-TiH_2 method were cited as theoretical foundations.The relationship between the yield of graphite and isotopic fractionation was proved by the relevant researches.Different calculation methods of graphite yield were compared,and suggestions for improvement were put forward.The factors influencing the yield of graphite in experimental processes were discussed.The optimum experimental conditions for preparing graphite target by Zn-TiH_2 method were briefly summarized.

关 键 词：加速器质谱仪(AMS) 14C样品制备 石墨靶 Zn-TiH2法 石墨产率 

分 类 号：TL56[核科学技术—核技术及应用] O657.63[理学—分析化学]