关键词: 宇宙成因核素测年, 石英分离提纯, HCl/H₂O₂和HF/HNO₃蚀刻, 超声波清洗器, 加热磁力搅拌器

Abstract: Cosmogenic dating(in situ cosmogenic nuclides)has been widely used in geologic and geographic domain along with the application of accelerator mass spectrometry(AMS)and highly sensitive conventional noble-gas mass spectrometry in the early 1980s,since Raymond Davis and Oliver Schaffer proposed that cosmogenic nuclides produced within minerals at the surface of the earth could be applied to geological problems.At present,this dating method is used to study glacier,desert and relief evolution,volcano development and active structure movement etc.There are a lot of materials which can be used in cosmogenic dating method.Because of its tight crystal structure,quartz can minimize possible contamination by meteoric ¹⁰Be,and also for its low ²⁷Al content,it becomes an ideal material for cosmogenic dating method.During the process of the isolation of ¹⁰Be and ²⁶Al from quartz sample,quartz isolation and purification are one of the key steps.HCl/H₂O₂ and HF/HNO₃ leaching is a safe method used to isolate and purify the quartz samples widely.However,there is defect about the method.It takes more time for sample preparation and curtails the life of instrument.Based on the above method,three experiments were designed to compare with the primary one.The results of experiment reveal that the purification efficiency can be enhanced by increasing the leaching solution concentration and the amount of sample,and ultrasonic cleaner can be replaced by hotplate /magnetic stirrer.

Key words: quartz isolation and purification, HCl/H₂O₂ and HF/HNO₃ leaching, ultrasonic tank, hotplate /magnetic stirrer, cosmogenic dating