What can cause high totals (107%) in Cassiterite EPMA analyses?

EPMA question: We were measuring Cassiterite samples on our Jeol FEG-EPMA (15kV, 15nA, focussed beam) - using a cassiterite primary Std to standardize Sn. On the unknowns (also cassiterite), we...

09 May 2023 5,970 4 View