Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
Original Papers
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
Tetsuo SAKAMOTOMasato MORITAKeita KANENARIHideki TOMITAVolker SONNENSCHEINKosuke SAITOMasaya OHASHIKotaro KATOTetsuo IGUCHIToshihide KAWAITakeo OKUMURAYukihiko SATOUIkuo WAKAIDA
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2018 Volume 34 Issue 11 Pages 1265-1270

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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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© 2018 by The Japan Society for Analytical Chemistry
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