säteilyllisiä

säteilyllisiä is a Finnish adjective used primarily as a descriptor for phenomena, processes, or objects that involve or are related to radiation. Derived from the noun säteily (radiation) and the adjectival suffix –llinen, the term specifically refers to items or activities that emit, absorb, or interact with radiation, both ionizing and non‑ionizing. In scientific and technical contexts it is frequently paired with words such as riski (risk), mittaus (measurement), or turvallisuus (safety) to form phrases like säteilylliset riskit, which address potential hazards associated with exposure.

The concept is applied broadly across fields such as medical diagnostics and treatment, where radiation is used in radiography, computed tomography, and radiation therapy. In industry it relates to processes involving ionizing radiation for materials testing or sterilization, as well as non‑ionizing applications like radio frequency devices and ultraviolet lamps. Environmental science uses the term when discussing natural background radiation from radon, cosmic rays, or terrestrial sources, and regulation bodies often list säteilyllisiä standards in setting permissible exposure limits.

In everyday Finnish the adjective can also appear in metaphorical usage, for instance describing a bright or vivid effect that suggests "radiating" quality, such as säteilylliset valot (radiant lights). The plural form säteilyllisiä thus conforms to Finnish grammatical rules, allowing it to modify plural nouns or appear in the partitive case. The term is commonly found in scientific literature, regulatory documents, media reports on nuclear safety, and educational material discussing health physics.