Proposal on dynamic correction method for resonance ionization mass spectrometry
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Proposal on dynamic correction method for resonance ionization mass spectrometry Takuma Noto · Hideki Tomita · Sven Richter · Fabian Schneider · Klaus Wendt · Tetsuo Iguchi · Jun Kawarabayashi
Published online: 20 March 2013 © Springer Science+Business Media Dordrecht 2013
Abstract For high precision and accuracy in isotopic ratio measurement of transuranic elements using laser ablation assisted resonance ionization mass spectrometry, a dynamic correction method based on correlation of ion signals with energy and timing of each laser pulse was proposed. The feasibility of this dynamic correction method was investigated through the use of a programmable electronics device for fast acquisition of the energy and timing of each laser pulse. Keywords RIMS · Safeguards · Isotope analysis · Correction method
1 Introduction Particle analysis on environmental samples for IAEA safeguards is useful to detect undeclared nuclear activity. More rapid and efficient analysis of the environmental particle samples is demanded with increasing nuclear activities over the world. The fission track—thermal ionization mass spectrometry (FT-TIMS [1]) is conventionally used for the particle analysis, however it is difficult to analyze the particles with diameter of less than 1 μm rapidly because each particle should be manipulated in FT-TIMS individually. We have proposed laser ablation assisted resonance ionization mass spectrometry (LA-RIMS) for the particle analysis, in which isotopic ratio
T. Noto, JSPS research fellow. Proceedings of the 6th International Conference on Laser Probing (LAP 2012), Paris, France, 4–8 June 2012. T. Noto (B) · H. Tomita · T. Iguchi · J. Kawarabayashi Department of Quantum Engineering, Nagoya University, Nagoya, Japan e-mail: [email protected] T. Noto · S. Richter · F. Schneider · K. Wendt Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany
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Fig. 1 Experimental setup of RIMS with RISIKO
analysis using LA-RIMS is suitable for desorption of each particle by laser ablation and following elementally-selective ionization without chemical pre-separation. To achieve high accuracy in isotopic ratio analysis using LA-RIMS, correction of measured isotopic ratio should be considered to suppress mass discrimination effects and difference in ionization efficiency due to isotope shift in optical transition. J. Levine, et al. studied the effect of the stabilization of laser system for high-precision in isotope ratio measurement of Fe and Cr [2]. In the case of high resolution RIMS for highly isotope-selective analysis, an injection locked Ti:Sapphire laser operated at high repetition rate with narrow band-width is one of the promising candidate for laser source. It is impossible to fix both the laser wavelength and the pulse timing of the injection locked Ti:Sapphire laser simultaneously due to uncertainty principle. Although internal correction method using natural abundance of dominant stable isotopes was investigated for stable Sr isotopic ratio measurement [3
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