# What is the typical measurement error in EDX peak location?

In EDX, peak locations (kV values) give information about elemental composition of a sample.

How accurate is the position of those peaks? For example, could Pd ($L_{\alpha}$ 2.838 kV) possible show up as Ag ($L_{\alpha}$ 2.984 kV)? And vice versa? What about element pairs with even smaller difference between their characteristic peaks?

• It depends on the accuracy of the calibration. – Pieter Dec 16 '16 at 23:32
• @Pieter so how accurate can this get? – Sparkler Dec 16 '16 at 23:43
• Depends also on resolution and on the number of ADC channels, but something like 1 % of the energy should be possible. So in this case, around 30 eV. – Pieter Dec 17 '16 at 3:40