Roentgen radiation and X-radiation

X-radiation and roentgen radiation are semantically related. In some cases you can use "X-radiation" instead a noun "Roentgen radiation".

X-radiation noun - Electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target.

Roentgen radiation and x-radiation are semantically related. You can use "Roentgen radiation" instead a noun phrase "X-radiation".