Krypton-81 Dating in Polar Ice Samples

一种测定极地冰或其他环境样品年代的新方法， 是50，000年至1，000，000岁的建议，根据 直接测量宇宙成因81 Kr（半衰期= 210，000年）。 的 该方法包括同位素富集的氪提取， 冰，然后使用超灵敏的81 Kr检测， 激光共振电离光谱技术。 81Kr技术的可行性将通过测量 81Kr在两个古老的冰样品和两个现代冰样品收集， 南极洲的艾伦山地区。 结果将提供基础 用于开发商业81Kr测年设备， 重要的应用，除了极地冰断代，在地下水 年代测定、水文学、太阳中微子研究和陨石研究。

A new method for dating polar ice or other environmental Samples which are 50,000 years to 1,000,000 years old is proposed, based on the direct measurements of cosmogenic 81Kr (half-life = 210,000 yrs.). The method consists of isotopic enrichment of the krypton extracted from the ice followed by ultrasensitive detection of the 81Kr using the laser-based technique of Resonance Ionization Spectroscopy. Feasibility of the 81Kr technique will be demonstrated by measuring 81Kr in two old ice samples and two modern ice samples collected from the Allan Hills area of Antarctica. The results will provide the basis for development of a commercial 81Kr-dating facility which will have important applications, in addition to polar ice dating, in groundwater dating, hydrology, solar neutrino studies, and meteorite studies.