What even is an x-ray?

I've always been taught the electromagnetic spectrum goes (in song form)... Radiowaves, Microwaves, Infrared... Radiation, Visible light, Ultraviolet, X-rays, Gamma rays. The assumption being that the higher the note sung (the later in the song), the higher the energy, the shorter the wavelength u.s.w. Therefore why are we calling my LINAC friends x-ray units?! Their … Continue reading What even is an x-ray?