I show how an X-ray fluorescence gun works, do a teardown and failure analysis, and discuss a new kind of XRF tech now "available" on eBay. The XRF data can be transferred from the gun to a PC, and analyzed with I did this for several materials, but ran out of time in this video to show the software usage, which is quite involved. Good overall description of XRF: %3A_University_Physics_(OpenStax)/Map%3A_University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/08%3A_Atomic_Structure/ %3A_Atomic_Spectra_and_X-rays Electron shell shielding described via roller derby ?! XRF supplies: MightyOhm geiger counter: The two XRF guns in this video were generously donated by one of my viewers. Thank you! The Tribogenics tape-peel XRF gun on eBay: Applied Science on Patreon: