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Report No.
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Remote isotopic analysis using laser spectroscopic technique

Miyabe, Masabumi   ; Oba, Masaki ; Akaoka, Katsuaki ; Wakaida, Ikuo  

Remote analysis of highly radioactive materials including actinide elements and fission products is a necessary technology for decommissioning of the Fukushima Daiichi Nuclear Power Plant. However, due to the intense radioactivity, it is difficult for the analysis engineer to directly handle the analytical samples, and the application of traditional radiochemical analysis is considered to be difficult. Therefore, we are developing a remote analytical technique by combining atomic absorption spectrometry and laser ablation technique requiring no sample pretreatment. When a solid sample is irradiated with a intense laser pulse, part of the surface materials evaporates and is decomposed into monoatomic species to form an ablation plume. When another laser beam tuned to the resonance frequency of the isotope of interest is intersected with the plume, the isotope ratio can be determined from the comparison of the absorbance for each isotope since only the isotope atoms absorb the laser light. In order to reduce the effects of the Doppler effect and the Stark effect to realize sensitive and isotope-selective analysis, it is necessary to optimize the experimental conditions. Thus, we measured the absorption spectra with various experimental conditions, and investigate variations in the spectral line-width and the absorbance. The experimental conditions for higher sensitivity were determined from the laser-induced fluorescence image of the plume observed at various observation timing. By evaluating the analytical performance of U and Pu using the obtained optimum conditions, it was demonstrated that this analytical technique is applicable to the isotope analysis of decommissioning related substances.

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