放射能

• 読み: ほうしゃのう
• ローマ字: houshanou
• 漢字の分解: 放 (hou) — emit, release; 射 (sha) — shoot; 能 (nou) — ability, power
• 発音: /hoː.ɕa.noː/

意味

Radioactivity; the property of certain substances to emit radiation through nuclear decay.

A noun for the physical phenomenon of radioactive decay. Became widely known in Japan after the atomic bombings and the Fukushima disaster. Distinct from 放射線 (radiation, the rays themselves) and 放射性物質 (radioactive material). Often used in news about nuclear energy and environmental concerns.

例文

1. 事故後、周辺地域の放射能を測定した。
2. 放射能汚染の影響は長期間に及ぶ。
3. 食品の放射能検査が厳しく行われている。

使い方ガイド

場面: science, news, environment, nuclear energy

トーン: serious

起源と歴史

From Sino-Japanese 放 (hou, to emit) + 射 (sha, to shoot) + 能 (nou, ability/power). Literally 'the ability to emit shooting rays,' describing the property of radioactive substances.

文化的背景

時代: Modern

世代: All ages

社会的背景: Universal