ISO 13318-3:2004描述了在液体中使用离心沉降法测定均质颗粒材料粒度分布的方法。固体浓度由X射线束的衰减决定。产生的信号可以转换为粒度分布。 本标准中描述的粒度分布测定方法适用于可分散在液体中的粉末或以浆液形式存在的粉末。 分析的典型粒度范围为0.1 m至5 m。该方法适用于所有颗粒具有相同有效密度、化学成分和类似形状的粉末。拥有原子序数大于12的元素的材料有望产生足够的X射线不透明度。悬浮液中的颗粒不应发生化学或物理变化。粒子的密度必须高于液体的密度。

ISO 13318-3:2004 describes a method for determining the particle size distributions of homogeneous particulate material using centrifugal sedimentation in a liquid. Solids concentrations are determined by the attenuation of an X-ray beam. The resulting signal enables conversion to a particle size distribution. The method of determining the particle size distribution described in this standard is applicable to powders which can be dispersed in liquids or powders which are present in slurry form. The typical particle size range for analysis is from 0,1 m to 5 m. The method is applicable to powders in which all particles have the same effective density, chemical composition and comparable shapes. Materials possessing elements with an atomic number greater than about 12 can be expected to produce adequate X-ray opacity. Particles should not undergo chemical or physical change in the suspension liquid. It is necessary that the particles have a higher density than that of the liquid.