1.
radioactive; radioactivity
The property of emitting radiation; used attributively to mean 'radioactive'. From 放射 (radiation) plus the suffix 〜性 (property, -ness).
放射性物質が検出された。
Radioactive material was detected.
放射性廃棄物の処理は難しい。
Disposing of radioactive waste is difficult.
この元素は強い放射性を持っている。
This element has strong radioactivity.
放射 (radiation) plus 〜性 (property, -ness). Used attributively before a noun, where it behaves like a no-adjective.
COMMON COLLOCATIONS:
- 放射性物質: radioactive material
- 放射性廃棄物: radioactive waste
- 放射性を帯びる: to be radioactive
DOMAIN:
A physics and environmental-science term; common in news about nuclear power and accidents.