Alpha ray and Particulate radiation

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

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

Particulate radiation noun - A stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons).

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