Method and device for isotope- selective measurement of...

G - Physics – 01 – N

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G01N 21/71 (2006.01) G01N 21/64 (2006.01)

Patent

CA 2347401

The invention relates to a method and device for isotope-selective measurement of chemical elements, especially radioactive elements, in materials, especially radioactive materials. The aim of the invention is to provide a method and a device which permits measurement of the total concentration and the isotope composition of the contained elements in a manner which is as easy as possible. To this end, an optical emission spectroscopy method, according to which plasma in the form of a sample vapor cloud is generated by laser ablation from a sample to be analyzed, is combined with a laser-induced fluorescence spectroscopy method, according to which the sample vapor cloud is analyzed by laser-induced excitation of fluorescence.

L'invention concerne un procédé ainsi qu'un dispositif permettant la mesure avec sélectivité isotopique d'éléments chimiques, en particulier d'éléments radioactifs, contenus dans des substances, en particulier des substances radioactives. L'objectif de l'invention est d'offrir un procédé et un dispositif permettant de mesurer, de la façon la plus simple possible, aussi bien la concentration totale que la composition isotopique des éléments contenus. A cet effet, il est proposé, pour effectuer la mesure, de combiner le procédé de spectroscopie d'émission optique, selon lequel un plasma sous forme d'un nuage de vapeur d'échantillon est produit par érosion au laser d'un échantillon à analyser, avec le procédé de la spectroscopie de fluorescence induite par laser, selon lequel il se produit une excitation de fluorescence du nuage de vapeur d'échantillon induite par laser.

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