Pulsed radiofrequency glow discharge time-of-flight mass spectrometry: Depth profile analysis of multilayers on conductive and non-conductive substrates

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and materials

“…217 Two U isotopic reference materials (CRM U-020 and CRM U-030) were also measured for quality assurance, ion counter gains and mass bias correction. Similar to the study by Varga et al, 215 LA-MC-ICP-MS was highlighted for its ability to identify inhomogeneous distribution of U within samples, with the large range of 235 U enrichment conrmed using SIMS, and four of the ve samples tested containing 236 U, indicative of the presence of reprocessed U.…”

“…225 A 30 second extraction step achieved quantitative recovery with approximately 100 ng sampled per extraction. The intra sample variability was around 30% RSD, which the authors claim was offset by <10% RSD for 235 U/ 238 U and (for enriched samples) 234 U and 236 U ratios. An additional benet was that it is a convenient, versatile approach for swipe samples in a range of applications.…”

“…The technique of LA-MC-ICP-MS with an extended dynamic range was used for U isotopic analysis by Yamamoto et al 218 Three Faraday detectors with 10 À11 and 10 À13 ohm resistors were tested for a series of solid materials on transient signals with LA durations of <3 seconds to minimise sampling volume. Using a tau correction technique, the 235 219 A high speed integrated ablation cell and dual concentric injector design was tested for U isotopic ratios. When compared with a slower washout, established low-volume cell design, the highly transient signals of the new design introduced a new bias, a major component of which was referred to as the 'blind time'.…”

“…When compared with a slower washout, established low-volume cell design, the highly transient signals of the new design introduced a new bias, a major component of which was referred to as the 'blind time'. The impact was modelled on UO X particles, with average precisions in sub-micron particles of 3% (1s) and 8% (1s) for 235 U/ 238 U and 234 U/ 238 U, respectively.…”

“…Lee et al assessed the signal-detection performance of TIMS with continuous heating for isotopic U measurements in the fg to pg range for nuclear safeguards. 221 Peak jumping mode with a single detector was compared with static mode using multiple detectors, with 235 U/ 238 U measured down to 1 fg and 3 fg in the two modes, respectively. Both modes could only measure down to 100 fg for 236 U/ 238 U.…”