Abstract
A new HCl-free chromatographic separation procedure has been developed for sequential separation of Zr and Mo from concrete matrices for selective measurement of 93Zr and 93Mo by ICP-MS/MS. The recoveries of greater than 90% for Zr and Mo from concretes could be achieved. The measurement condition was optimized for complete suppression of interferences from 93Nb and peak tailing from abundant isotopes of Zr and Mo in concrete matrices. The removal of interferences was verified by measurement of radio-contamination-free concretes used as a sample matrix blank. Method detection limits of 1.7 mBq g− 1 and 0.2 Bq g− 1 were achieved for, respectively, 93Zr and 93Mo in the concrete matrices. The interference removal factor for Nb (equivalent to the decontamination factor in radiochemical separation) was of the order of 105, and the abundance sensitivity was of the order of 10─8, indicating that the developed method is reliable for verifying the presence of ultralow concentrations of 93Zr and 93Mo. The present method is suitable for the rapid assessment of 93Zr and 93Mo for radioactivity inventory of concrete rubble.
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The present study is carried out under the research program based on subsidy to the International Research Institute for Nuclear Decommissioning (IRID) by Ministry of Economy, Trade and Industry, Japan.
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Do, VK., Furuse, T., Murakami, E. et al. Development of HCl-free solid-phase extraction combined with ICP-MS/MS for rapid assessment of difficult-to-measure radionuclides. Part I: Selective measurement of 93Zr and 93Mo in concrete rubble. J Radioanal Nucl Chem 327, 543–553 (2021). https://doi.org/10.1007/s10967-020-07503-z
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DOI: https://doi.org/10.1007/s10967-020-07503-z