Usage Note
Radiactivo is the standard spelling in Spanish (one word, without a hyphen), though radioactivo also appears in informal usage and is listed as a variant by the RAE. The noun form is la radiactividad. The adjective agrees in gender: material radiactivo, sustancia radiactiva.
Examples
"El residuo radiactivo se almacena de forma segura."
Natural Translation
The radioactive waste is stored safely.

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