Comparison of resonance ionization mass spectrometry systems for the determination of 135Cs/137Cs isotope ratios

Leticia S. Pibida; C. A. McMahon; Wilfried Nortershauser; Bruce A. Bushaw

doi:10.1117/12.463833

28 March 2002 Comparison of resonance ionization mass spectrometry systems for the determination of ¹³⁵Cs/¹³⁷Cs isotope ratios

Leticia S. Pibida, C. A. McMahon, Wilfried Nortershauser, Bruce A. Bushaw

Author Affiliations +

Proceedings Volume 4634, Methods for Ultrasensitive Detection II; (2002) https://doi.org/10.1117/12.463833
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States

Abstract

The performance of the Resonance Ionization Mass Spectrometry (RIMS) system at the National Institute of Standards and Technology (NIST) has been compared to a similar system at Pacific Northwest National Laboratory (PNNL). Efficiency and selectivity measurements were performed with both systems and compared to conventional thermal ionization mass spectrometry (TIMS). Determination of the ¹³⁵Cs / ¹³⁷Cs ratio was performed using single-resonance excitation 6s ²S_1/2 (F equals 4) to 6p ²P_3/2 (F equals 5) with an extended cavity diode laser followed by photoionization with the 488 nm line of an argon ion laser. Optical selectivity of more than 2 orders of magnitude against stable ¹³³Cs was attained for ¹³⁵Cs and ¹³⁷Cs for both systems with an overall selectivity of 10⁹ for the PNNL system and 10⁸ for the NIST system. Overall efficiencies of 2x10^-6 and 5x10^-7 were measured for the PNNL and NIST systems respectively. Measurements to determine the chronological age of a nuclear burn-up sample have been performed using both RIMS systems as well as TIMS.

Citation Download Citation

Leticia S. Pibida, C. A. McMahon, Wilfried Nortershauser, and Bruce A. Bushaw "Comparison of resonance ionization mass spectrometry systems for the determination of ¹³⁵Cs/¹³⁷Cs isotope ratios", Proc. SPIE 4634, Methods for Ultrasensitive Detection II, (28 March 2002); https://doi.org/10.1117/12.463833

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