目前我国只有中国原子能科学研究院49-2堆为Ar-Ar定年提供辐照服务，且该堆安排给Ar-Ar定年辐照的时间非常有限，无法满足国内Ar-Ar实验室的需要。更为严重的情况，2011年49-2堆改造之后，可能由于热中子/快中子比值增加1倍，辐照的样品“空气氩”大幅度升高，如标样ZBH-25黑云母的“空气氩”由原来<10%增加到高达40%，这种“空气氩”从中温到高温直到熔融，一直保持相当比例，并非矿物表面吸附的空气，而是进入矿物晶格结构的气体，无法事先处理掉。另外，辐照后产生的杂质气体也非常严重，且几乎无法彻底纯化干净，使得Ar-Ar数据质量严重下降甚至不可信。对于京外的Ar-Ar实验室，放射性样品运输也是非常严重的问题。本项目是基于上述状况提出来的，意在开辟新的辐照途径，使我国Ar-Ar年代学研究工作正常继续进行，为地球科学提供高质量的Ar-Ar年代学数据。

Only the 49-2 reactor provides irradiation for Ar-Ar dating at present in China with limited sevice. It cannot come to meeting demand of Ar-Ar dating. More serious cases happended after the reactor transformation in 2011. The "air argon" increases much more for the irradiated samples. The Chinese standard sample ZBH-25 biotite contain "air argon" as high as 40% from the original <10%. On the other hand, the impurity in the irradiated samples is very serious, which cannot be cleaned up competely, resulting in poor and even uncredible Ar-Ar data. To the Ar-Ar laboratories outside Beijing, transportation for the irradiated samples is also a serious problem. Based on these situations, this proposal will open up new ways of irradiation, make our Ar-Ar dating continue and provide high quality Ar-Ar data for the Chinese geosciences.