particulate : Idioms & Phrases
particulate matter
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noun a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant)
particulate.
WordNet
particulate radiation
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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)
corpuscular radiation.