Any of the elements in the series (actinide series) of radioactive, metallic chemical elements from element 89 (actinium) through element 103 (lawrencium). These elements resemble lanthanides in electronic structure.

Naturally occuring. Radioactive compounds generally found in uranium ore. Actinides are known to interfere with Federation sensors.
TNG: The Mind's Eye - The crew of the Enterprise encountered these in the Ilkalian asteroid belt. The actinides made it difficult to locate the Kriosian rebels.

The Particles of Star Trek

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