Ionizing radiation and Roentgen ray

Ionizing radiation noun - High-energy radiation capable of producing ionization in substances through which it passes.

Roentgen ray and ionizing radiation are semantically related. In some cases you can replace phrase "Roentgen ray" with "Ionizing radiation", this phrases are similar.

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

Ionizing radiation and roentgen ray are semantically related. Sometimes you can use "Ionizing radiation" instead a noun phrase "Roentgen ray".