A lot of industrial NDT X-ray inspection is done using Isotope sources. Both Cobalt 60 and Iridium 192 are often used. While it’s easy to find a Co60 X-ray spectrum, I couldn’t find a simple table of energy vs. intensity for Iridium, so I had to do some digging.
Here’s a plot I created from values collected from several sources, the values can be found after the break:
It’s also easy to calculated the weighted average to get a mean energy of 348 keV.