UNE-EN ISO 22765:2019

This document describes the ceramographic procedure used to prepare sintered (U,Pu)O2 pellets for

qualitative and quantitative examination of the pellet microstructure.

The examinations are performed before and after thermal treatment or chemical etching.

They allow

observation of any cracks, intra- and intergranular pores or inclusions, and

measurement of the grain size, porosity and plutonium homogeneity distribution.

The mean grain diameter is measured by one of the classic methods: counting (intercept method),

comparison with standard grids or typical images, etc.[2] The measurement of individual grain sizes

requires uniform development of the microstructure over the entire specimen.

The plutonium cluster and pore distribution and localization are generally analysed by automatic

image analysis systems. The plutonium distribution is usually revealed by chemical etching but alphaautoradiography

can also be used. The first technique avoids the tendency for autoradiography to

exaggerate the size of plutonium-rich clusters due to the distance the alpha particles travel away from

the source.