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<p>ISO 22765:2016 describes the ceramographic procedure used to prepare sintered (U,Pu)O<sub>2</sub> pellets for qualitative and quantitative examination of the pellet microstructure.</p>
<p>The examinations are performed before and after thermal treatment or chemical etching.</p>
<p>They allow</p>
<p>- observation of any cracks, intra- and intergranular pores or inclusions, and</p>
<p>- measurement of the grain size, porosity and plutonium homogeneity distribution.</p>
<p>The mean grain diameter is measured by one of the classic methods: counting (intercept method), comparison with standard grids or typical images, etc.<sup>[2]</sup> The measurement of individual grain sizes requires uniform development of the microstructure over the entire specimen.</p>
<p>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 alpha-autoradiography 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.</p>
Reģistrācijas numurs (WIID)
63947
Darbības sfēra
<p>ISO 22765:2016 describes the ceramographic procedure used to prepare sintered (U,Pu)O<sub>2</sub> pellets for qualitative and quantitative examination of the pellet microstructure.</p>
<p>The examinations are performed before and after thermal treatment or chemical etching.</p>
<p>They allow</p>
<p>- observation of any cracks, intra- and intergranular pores or inclusions, and</p>
<p>- measurement of the grain size, porosity and plutonium homogeneity distribution.</p>
<p>The mean grain diameter is measured by one of the classic methods: counting (intercept method), comparison with standard grids or typical images, etc.<sup>[2]</sup> The measurement of individual grain sizes requires uniform development of the microstructure over the entire specimen.</p>
<p>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 alpha-autoradiography 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.</p>
