Author:
Pibida L.,Nörtershäuser W.,Hutchinson J.M.R.,Bushaw B.A.
Abstract
The ability of Resonance Ionization Mass Spectrometry (RIMS) to reliably determine the ratio of 135Cs/137Cs in the presence of large backgrounds has been evaluated. Single-resonance excitation of Cs 6s 2S1/2(F=4)→6p 2P3/2(F'=5) with an extended cavity diode laser was followed by photoionization with the 488 nm line of an argon ion laser. While the principal objective was to avoid isobaric interferences, an optical selectivity of 3 orders of magnitude against stable 133Cs was attained for both 135Cs and 137Cs. The overall RIMS efficiency was found to be ∼ 2×10-6 with a combined (laser and mass spectrometer) selectivity of ∼ 1010 for both 135Cs and 137Cs against 133Cs. The performance with respect to efficiency, selectivity, and isobar suppression has been compared to conventional thermal ionization mass spectrometry (TIMS). Measurements to determine the chronological age of a burn-up sample have been performed using both methods.
Subject
Physical and Theoretical Chemistry
Cited by
24 articles.
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