【摘要】 <正> 粉末压片制样方法,简便快速,无需昂贵的铂-黄金坩埚,在XRF分析中一直被广泛地应用。R.P.Gardner等人用一种统一的推导方法概述了前人所建立的各种XRF强度与粉末粒度、压紧率(packing fraction)之间的数学关系。对分析工作者所关心的另一重要问题-粉末制样误差与粒度等因素的关系,国内外尚未见有深入研究报告,本文用Monte Carlo方法对此作一初步探讨。一.模型假设(参见图1) (1)样品具有相对于X-射线穿透深度而言的无限厚度和无限截面积,且仅由对X-射更多还原

【Abstract】 Some simulation tests have been made for XRF processes with powdered samples. The results showed that the coefficients of variation of XRF relative intensity caused by preparing powdered sample increase linearly as particle size increases, vary slightly with the variation of packing fraction, and increase quickly as clement measured falls into low concentration. The simu lation results are mainly identical with experiments.更多还原