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Isotope-selective Microscale Imaging of Radioactive Cs without Isobaric Interferences Using Sputtered Neutral Mass Spectrometry with Two-step Resonant Ionization Employing Newly-developed Ti:Sapphire Lasers

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Abstract

The characterization of radionuclides in Fukushima is important to determine their origins and current state in the environment. Radionuclides exist as fine particles and are mixed with other constituents. A measurement method with both micro-imaging capability and highly selective element detection is necessary to analyze these particles. We developed such an imaging technique using a time-of-flight secondary ion mass spectrometry and wavelength-tunable Ti:Sapphire lasers for the resonance ionization of target elements without mass interference. This is called resonant laser ionization sputtered neutral mass spectrometry. The instrument has a high lateral resolution and a higher ionization selectivity using two-step resonance excitation of Cs with two lasers at different wavelengths. Optimization of the wavelength for resonance ionization using a Cs compound was performed, and a real environmental particle containing radioactive Cs was analyzed. Isotope images of three kinds of Cs were successfully obtained without interfere from Ba isotopes for the first time.

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Acknowledgments

This study supported by “Development of System and Technology for Advanced Measurement and Analysis” SENTAN, JST.

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Authors and Affiliations

  1. Department of Applied Physics, Kogakuin University, 2665-1 Nakano-machi, Hachioji, Tokyo, 192-0015, Japan

    Tetsuo Sakamoto, Masato Morita & Keita Kanenari

  2. Department of Energy Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603, Japan

    Hideki Tomita, Volker Sonnenschein, Kosuke Saito, Masaya Ohashi, Kotaro Kato & Tetsuo Iguchi

  3. Japan Neutron Optics Inc., 20-5 Takeshima-cho, Gamagori Aichi, 443-0031, Japan

    Toshihide Kawai & Takeo Okumura

  4. Collaborative Laboratories for Advanced Decommissioning Sciences, Japan Atomic Energy Agency, 790-1 Otsuka, Motooka, Tomioka, Fukushima, 979-1151, Japan

    Yukihiko Satou & Ikuo Wakaida

Authors
  1. Tetsuo Sakamoto
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  2. Masato Morita
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  3. Keita Kanenari
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  4. Hideki Tomita
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  5. Volker Sonnenschein
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  6. Kosuke Saito
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  7. Masaya Ohashi
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  8. Kotaro Kato
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  9. Tetsuo Iguchi
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  10. Toshihide Kawai
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  11. Takeo Okumura
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  12. Yukihiko Satou
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  13. Ikuo Wakaida
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Corresponding author

Correspondence to Tetsuo Sakamoto.

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Sakamoto, T., Morita, M., Kanenari, K. et al. Isotope-selective Microscale Imaging of Radioactive Cs without Isobaric Interferences Using Sputtered Neutral Mass Spectrometry with Two-step Resonant Ionization Employing Newly-developed Ti:Sapphire Lasers. ANAL. SCI. 34, 1265–1270 (2018). https://doi.org/10.2116/analsci.18P249

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  • DOI: https://doi.org/10.2116/analsci.18P249

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