TN-106 PhotonAssay™ Measurement Performance for Gold – Impact of U, Th, Ba
For those who want to understand how PhotonAssay™ performs in the presence of U, Th, and Ba.
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What this note covers
How uranium, thorium and barium increase gamma-ray background and impact PhotonAssay™ gold measurement precision and detection limits
Quantitative detection limit data: baseline 2-sigma detection limit of 0.01 ppm rising to 0.051 ppm at combined U+Th of 50 ppm, and 0.048 ppm at 1 wt% barium
Precision impact at specific gold grades (0.1, 0.3, 1 and 3 ppm) across a range of U, Th and Ba concentrations
High-background (HB) flag thresholds — the elemental concentrations at which PhotonAssay™ flags significantly impacted measurements
Maximum recommended interfering element levels for standard gold services (PAAU02): 80 ppm combined U+Th, or 1.8% barium
Availability of a predictive model for estimating assay performance in high-background materials
