The ICP-MS 7900 Performance channel counts are constantly fluctuating with the Li count trending down over time before cleaning takes place. What's interesting are the inconsistencies observed with Y and Tl. These results were observed after a service visit. The cones were cleaned with no jagged edges, nebulizer checked, tubing, graphite gasket, torch and shield replaced but I continue to have this problem. Aside from replacing the EM and calling support not sure what else to investigate.
