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Bulgheroni a , A. Martinez Ferri a , Y. Miard b and Ph. Box , D Karlsruhe, Germany. E-mail: michael. The time-resolved U and U MC-ICP-MS signals obtained from individual laser shots were processed automatically using software specifically developed for this purpose.
A linear relationship between the number of laser shots and the average depth of the laser ablation craters was established using confocal laser scanning profilometry. The ns-laser ablation system produced conical craters whose diameters were shown to increase with the number of laser pulses. The shape and roughness of the craters were studied as a function of both the number of pulses and focusing conditions. The ordered, rectangular structure disappeared progressively with increasing number of laser pulses, while simultaneously a sub-micrometric porosity developed.
It is essential to study uranium self-diffusion as it is thought to control many key engineering properties such as creep, sintering, and fission product behaviour that are all very important to several stages of the nuclear fuel cycle. Further a systematic study of this property provides an insight into the characteristics of uranium point defects which is difficult to do any other way as these defects are present in the material only in very small quantities.
Despite all of its advantages, LA-ICP-MS suffers from some important limitations such as non-uniform ablation processes and matrix-dependent melting events. Depth profiling may suffer from so-called downhole fractionation DHF , mainly caused by differences in the volatility and chemical properties of the measured elements.
If these technical restrictions are overlooked, mixing of neighbouring material layers may occur thereby deteriorating the depth resolution.