【摘要】 <正> 一、引言质谱分析方法是同位素比测量的最精密的方法之一,也是最普遍的可靠测量手段。它能在极其微小的变化和涨落内测定同位素的含量和差异。在岩石和矿物等许多天然体中存在大量的碳、氢、氧、硫等元素及其化合物。随着一定的物理和化学作用等天然条件的改变,引起它们的同位素比的微小改变,即同位素分馏。应用质谱分析技术精确测定这些微小的改变,可以获得阐明这些变化因素的可靠实验数据,从而对了解岩石和矿物的来源、区分矿床的类型和成因等起着重要的作用。因此同位素比更多还原

【Abstract】 There are six equations have been derived from the double standard mathod of accurate determination of isotope ratio in this paper, Several methods of measuring isotope ratio can be designed according to the basis of these equations.The determinate result of each method is coincide with the standard deviation. Most of the results measurd by MAT-Ch5 mass spectrometer coincided with that measured by MM602D mass spectrometer.更多还原