X-ray fluorescence is a well established analytical tool for measuring elemental composition of fairly large (~ 5cm2) "cold" samples. A version of t h i s technique has been developedfor analysis of radial distribution of fission products Xe, Cs and Ba in irradiated UO2 fuel samples. About 0.1 mm thin slices of fuel pellets (full cross sections) are irradiated by 50 keV X-rays. The intensity of the Xe (Cs, Ba) Ko fluorescenceradiation generated is measured by means of a Ge detector fitted with a collimator. The slit is 0.5 mm wide in the scanning direction and 2 mm long. The measured Xe Ko x-ray intensities are converted to absolute concentrations by comparing to the intensity from a Xe gas standard. In the case of Cs and Ba solid standards may be used. The X-ray fluorescence analysis is compared to other techniques used to obtain radial fission product profiles, it is shown how a combination of X-ray fluorescenceand electron probe micro analysis is able to reveal the amount of Xe in the grain boundary porosities.
|Place of Publication||Roskilde|
|Publisher||Risø National Laboratory|
|Number of pages||21|
|Publication status||Published - 1986|