Alpha ray and Ionizing radiation

Alpha ray noun - The radiation of alpha particles during radioactive decay.

Ionizing radiation and alpha ray are semantically related. In some cases you can use "Ionizing radiation" instead a noun phrase "Alpha ray".

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

Alpha ray and ionizing radiation are semantically related. Sometimes you can replace phrase "Alpha ray" with "Ionizing radiation", this phrases are similar.