摘要:
放射性同位素14C测年技术广泛应用于第四纪地质学、考古学、海洋学和古气候等学科.常规14C测年,是采用β衰变低本底液体闪烁计数仪记录一定时间间隔内一定量样品中14C原子衰变数目的方法,由于仪器操作简单、方便,在不受样品量限制的情况下,测试的精度能够满足测年的要求.14C测年液闪法样品制样前处理系统主要在真空玻璃系统中完成,但真空玻璃系统容易出现破碎、断裂,每个实验室需要配备专门的玻璃焊耗师傅维护和维修真空玻璃系统,制约着14C测年技术的发展.文章探讨了常规14C制样系统的升级改造,建立了一套金属系统、不用玻璃焊量,无油污染、安装方便、拆卸灵活的常规14C测年样品制备系统,该套系统解决了常规14C发展中遇到的难点问题,使得常规14C测年技术得到更好的推广和应用.
Abstract:
Radioisotope 14C dating techniques are widely used in quaternary geology,archaeology,oceanography and paleoclimate.The conventional 14C dating method can record the number of 14C atoms by β decay low background liquid scintillation counter of a certain amount of samples in certain time inteval.As the equipment is simple and convenient,the accuracy of the test can meet the requirement of dating without being limited by the sample weight.The preparation system for 14C dating liquid scintillation method is mainly completed in the vacuum glass system,which is prone to breakage and fracture.Therefore a special welding master is needed in each laboratory to maintain and repair the vacuum glass system,which restricts the development of 14C dating techniques.This paper discusses the upgrading and transformation of the conventional 14C sample preparation system,and has developed a conventional 14C dating metal preparation system with metal material with the advantages of no glass welding,no oil pollution,easy installation and flexible disassembly.This system has solved the problems encountered in the development of conventional 14C dating,and can help promoting the application of regular 14C dating techniques.
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