In contrast to the SHRIMP II results of Stern and Amelin (2003), we find no discernible geometry effect resulting from secondary ion steering in the UCLA data ("LT1 Def A").This suggests that variations in interelement fractionation during ion bombardment are largely independent of instrumental design and that interelement fractionation in ion microprobe U-Pb analysis can be monitored to an external reproducibility of ~1-2%.
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Subsequently, intensities were measured in 15 magnet cycles.
Isotopic ratios are then calculated using raw intensities corrected for electron multiplier dead-time and drift-corrected mid-analysis values.
At the beginning of an analytical session or when analytical parameters such as primary beam intensity or spot size were changed, energy offsets for all measured ion species must be determined.
Pb have characteristic energy distributions (see Figure) and therefore optimizing intensities and finding a region in the energy distribution sufficiently stable to minimize interelement fractionation is a prerequisite for analysis.