量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Development of low-temperature fusion using ammonium hydrogen fluoride for rapid determination of actinides in environmental and nuclear decommissioning samples
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In this study, a green and rapid analytical method was developed for determination of 237Np and Pu isotopes in environmental and nuclear decommissioning samples, such as soil, marine sediment and concrete samples. The methods consisted of NH4HF2 fusion incorporated with procedure for CaF2/LaF3 co-precipitation, extraction chromatography or anion-exchange chromatography and ICP-MS measurement. ICP-MS, as an atom-counting approach that counts the atoms themselves, irrespective of their decay mode, specific activity, or half-life, is gradually replacing/has replaced conventional radiometric methods, for ultra-sensitive analysis of actinides. The fusion procedure was done at 250oC on a portable hot plate instead of in a cumbersome muffle furnace and took only 15 min. Chemical recoveries of 237Np and Pu after completing the NH4HF2 fusion method and chromatographic separation for 0.5-1 g sample were approximately 70-90%. The NH4HF2 fusion was capable of completely releasing actinides from samples that were pre-ignited at temperatures over 450 oC to 1000 oC, which was comparable to releases obtained by the hazardous and time-consuming HNO3-HF digestion. Additionally, because HF is not used in any procedure of the NH4HF2 fusion, a safer and greener alternative to HNO3-HF digestion is realized for rapid 237Np and Pu isotopes determination in soil, marine sediment and concrete samples. It takes approximately one day for 10 sample analysis (NH4HF2 fusion and sample transferring, 0.5 h; CaF2/LaF3 coprecipitation and filtration, 1.5 h; chromatographic separation and sample preparation, 5.5 h; ICP-MS measurement, 0.5 h) which is less than the conventional acid digestion methods.
Development of low-temperature fusion using ammonium hydrogen fluoride for rapid determination of actinides in environmental and nuclear decommissioning samples
