本文件规定了一种测定自由流动二氧化铀（UO2）粉末表观密度和振实密度的方法，该粉末将用于作为核燃料的UO2颗粒的造粒和烧结。 该方法可用于不同类型的UO2粉末，包括颗粒、颗粒、球体或其他类型的颗粒。该方法也可应用于其他燃料粉末如PuO2、ThO2和粉末混合物如UO2-PuO2和UO2-Gd2O3。 本文件基于使用流量计漏斗的原理（见4。 1). 也可以使用其他测量设备，例如Scott容量计。

This document specifies a method of determining the apparent density and tap density of free-flowing uranium dioxide (UO2) powder which will be used for pelleting and sintering of UO2 pellets as a nuclear fuel. This method can be used for different UO2 powder types including grains, granules, spheres or other kinds of particles. The method can also be applied to other fuel powders as PuO2, ThO2 and powder mixtures as UO2-PuO2 and UO2-Gd2O3. This document is based on the principle of using a flowmeter funnel (see 4.1). Other measurement apparatus, such as a Scott volumeter, can also be used.