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Spectroscopic analysis of radioactive strontium with low isotopic abundance using laser resonance ionization

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Abstract

Strontium-90 (90Sr, half-life of 28.8 years) is one of the major fission products released in the Fukushima Daiichi Nuclear Power Plant accident in Japan. Due to the high concentrations of Sr stable isotopes in marine products, an upper limit for 90Sr isotopic abundance in them is of the order of 1 ppb or less. Resonance ionization technique using narrow linewidth lasers is suitable for analysis requiring high elemental and isotopic selectivity. In this study, we have investigated on 689.4 nm - 487.4 nm - 393.8 nm three-step resonance ionization of Sr atoms, where the 90Sr isotope shifts in the second and third transitions were predicted using a King plot approach to evaluate the optical isotopic selectivity. As the first step in measuring real samples, the influence of coexisting elements in seawater was also derived.

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Acknowledgements

A part of this work was supported by JSPS KAKENHI Grant Number JP16H04639 and also by the Nuclear Energy Science & Technology and Human Resource Development Project (through concentrating wisdom) from the Japan Atomic Energy Agency.

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Correspondence to Yoshihiro Iwata.

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This article is part of the Topical Collection on Proceedings of PLATAN 2019, 1st International Conference, Merger of the Poznan Meeting on Lasers and Trapping Devices in Atomic Nuclei Research and the International Conference on Laser Probing, Mainz, Germany 19-24 May 2019

Edited by Krassimira Marinova, Michael Block, Klaus D.A. Wendt and Magdalena Kowalska

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Iwata, Y., Cheon, D., Miyabe, M. et al. Spectroscopic analysis of radioactive strontium with low isotopic abundance using laser resonance ionization. Hyperfine Interact 241, 29 (2020). https://doi.org/10.1007/s10751-020-1700-x

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  • DOI: https://doi.org/10.1007/s10751-020-1700-x

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