XRF machines are designed to have a small footprint. Typical XRF tubes use a high-voltage well to connect the high-voltage cable. It is a common cause of arcing. But Micro X Ray Inc. has eliminated the high voltage well, reducing failures due to arcing.
Micro X-Ray Inc.
370 Encinal Street, Suite 200, Santa Cruz, CA, United States 95060
https://microxray.com/applications/x-ray-fluorescence-xrf/