XRF of a modern US cent, thin copper over zinc core. One side has the copper removed. XRF of both sides .mca's attached. Exciter = W target tube, @ 50kV / 10 uA
This is a fail because the HV is set to high, and so is the current, causing excitation deeper than need be, allowing Zn to overwhelm the copper signal.
Am excitation would prove to be a better choice, in that the Alpha Particles help with surface excitation only.
A little common sense prevails.
Geo
