论文部分内容阅读
为发现各种元素的异常值,常采用半定量光谱分析方法。这种方法的特点是:快速、经济、灵敏度高和所用样品称量少。该方法的灵敏阈对大多数元素来说均低于其最低异常值,因此用此分析方法可以发现这些元素的异常值。但是半定量光谱分析不能测定铀的异常值,因为该方法的灵敏阈为0.01％铀,而对大多数类型的岩石来说铀的克拉克值较该值低二个数量级。所以通常都采用放射性测量(α或β)法或萤光法测定金属量测量样品中的铀。α辐射测量结果与样品中钾的存在和人工放射
In order to find the outliers of various elements, semi-quantitative spectroscopy is often used. This method is characterized by: fast, economical, high sensitivity and less sample weighed. The sensitivity threshold for this method is below its lowest anomaly for most elements, so using this method you can find outliers. However, semi-quantitative spectroscopy does not allow the determination of uranium anomalies because the sensitivity threshold of this method is 0.01% uranium, whereas for most types of rock the uranium Clarke value is two orders of magnitude lower than this value. Therefore, radioactivity measurement (α or β) method or fluorescence method is usually used to determine the amount of metal in the measurement of uranium in the sample. Alpha radiation measurements are associated with the presence of potassium and artificial radiation in the sample