Boundary Effects in Mapping

[John Donovan]

Here is a good example of what one sees when mapping a high energy x-ray line (Cu ka) and a low energy x-ray line (Al ka) in a material with distinct phase boundaries:

In these maps the Al detector is in the upper right and the Cu detector is in the upper left. One can observe the effects of detector orientation on the Al signal when the Cu boundary is on the side towards the Al detector, therefore the Al signal is reduced through absorption. And also the "defocus beam" effect where the Al signal is over corrected by the bulk matrix effect assumption when the Cu boundary is towards the Cu detector.