Ionizing radiation and X-radiation

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

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

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

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