Quantulua-1220型低本底液闪仪的性能测定  

THE PERFORMANCE TEST OF QUANTULUA-1220 LIQUID SCINTILLATION COUNTER

作　　者：郑勇刚[1] 尹金辉[1] 刘粤霞[1] 

机构地区：[1]中国地震局地质研究所,地震动力学国家重点实验室,北京100029

出　　处：《地震地质》2005年第4期624-632,共9页Seismology and Geology

基　　金：地震科学联合基金重点课题(201018);国家自然科学基金项目(40202015)共同资助。

摘　　要：Quantulua-1220型低本底高灵敏度液闪仪是14C测年系统中的关键设备,其质量直接影响14C测年数据的准确性,文中使用中国糖碳、合成本底和成对样品来评估新购置的Quantulua-1220型低本底液闪仪的本底、探测效率及仪器的长期稳定性等重要性能指标是否满足14C测年要求。测试结果表明,在一般工作环境下,液闪仪的本底低于0.5cpm,最大可测14C年龄估计值为48ka;由于猝灭因素引起的年龄偏差不超过100a,新液闪仪经过10个月的运行后,所测定的14C年龄具有可对比性。We use the Chinese Sucrose Standard and synthetical benzene as well as 13 paired-samples to assess the performance of a new Quantulua-1220 bought in July, 2004. The results show that：1） when the background is below 0.5cpm and the fluctuation does not exceed 4‰ in the measuring surrounding, we infer the maximum datable age for this instrument would be up to almost 48ka; 2） The quench SQP （E） parameters of 261 radiocarbon samples vary from 700 to 758. The median is 735. 522 and standard deviation is 9. 150 57. The maximum age error caused by quenching factor is below 80a; 3） The t test results of 13 paired-samples indicate that the new Quantulua-1220 became stable after it ran for l0 months and the ages are indistinguishable in statistical test from ages supplied by other similar LSCs.

关 键 词：14^C测年猝灭校正液闪仪 

分 类 号：P533[天文地球—古生物学与地层学]