[RightWhale]

The grating of the spectrometer is round rather than a series of parallel straight lines. It's a mechanical device of metal rather than glass and the framework is aluminum and the optical parts are gold.

[sleavelessinseattle]

Fascinating...I presume the denser the material that the "optical" part of the spectrometer, the greater the distinctions that would show up between different frequencies of X-rays... I wonder why they didn't go with an even heavier metal??? Perhaps corrosion resistance...APOD Allways delivers the good stuff!!!