> The X-Ray source is the X-ray machine.

Healthcare-grade x-ray tubes to put in your (expensive) x-ray machine are not something you easily can obtain without a license.

Here in New Zealand you get a licence after purchasing the equipment, and require the machine spec, date of manufacture and serial number to get the licence.

It does require a radiologist name on the paperwork as they are the one with the radiation licence. However it is possible to get one if not a radiologist (dentists do, and radiographers have).

Being licensed to use the equipment is the hard bit, as insurance companies require accreditation which is hard to get.