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Report No.

Development of resonance ionization mass spectrometry of Sr isotopes, 4

Miyabe, Masabumi  ; Oba, Masaki ; Akaoka, Katsuaki ; Wakaida, Ikuo ; Iwata, Yoshihiro*  ; Jung, K.*; Hasegawa, Shuichi*

For the radioactivity evaluation regarding to the accident of TEPCO Fukushima Daiichi Nuclear Power Station, time-consuming and skills-required sample pretreatments for $$^{90}$$Sr analysis (radiometric or ICP-MS analyses) is serious issue. We are developing a ultra-sensitive and rapid analytical technique for $$^{90}$$Sr by combining resonance ionization spectroscopy, in which only the atoms of specific isotope can be ionized using the slight difference in level energy, and ion trap technique, in which only the ions of specific isotope can be trapped for a long duration to observe them with high sensitivity. In this study, we applied a continuous-wave isolated-core excitation technique (cw-ICE) for the first time to search for highly efficient and isotope-selective ionization schemes, especially for the Rydberg series converging to the 5$$p_{1/2,3/2}$$ ionic levels, of which information is quite scarce. As a result, we have revealed a detailed level-structure of autoionizing 5$$p_{1/2,3/2}$$(nl) series of Sr atoms.



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