放 射 能(ほうしゃのう)

ほうしゃのう

noun

radioactivity

1. radioactivity

The property of certain substances to emit radiation through the decay of atomic nuclei. Also used loosely in everyday language to refer to radiation or radioactive contamination in general.

放射能(ほうしゃのう)が検出(けんしゅつ)された。

Radioactivity was detected.

食品(しょくひん)の放射能(ほうしゃのう)検査(けんさ)が行(おこな)われている。

Radioactivity testing of food products is being conducted.

事故(じこ)によって大量(たいりょう)の放射能(ほうしゃのう)が環境(かんきょう)に放出(ほうしゅつ)された。

A large amount of radioactivity was released into the environment due to the accident.

Usage

Strictly speaking, 放射能(ほうしゃのう) refers to the property of emitting radiation, while 放射線(ほうしゃせん) refers to the radiation itself, and 放射性(ほうしゃせい)物質(ぶっしつ) refers to radioactive material. However, in everyday Japanese, 放射能(ほうしゃのう) is often used loosely to refer to any of these.

Common collocations

放射能(ほうしゃのう)汚染(おせん): radioactive contamination
放射能(ほうしゃのう)漏(も)れ: radiation leak
放射能(ほうしゃのう)検査(けんさ): radioactivity testing
放射能(ほうしゃのう)レベル: radioactivity level

Related words

放射線(ほうしゃせん): radiation (the rays themselves)
放射性(ほうしゃせい): radioactive (as prefix/adjective)

Related Words

Related: 放射線(ほうしゃせん) (radiation (rays))

Related: 放射性(ほうしゃせい) (radioactive)

Related: 原子力(げんしりょく) (nuclear power, atomic energy)

general

Added 2026.2.23 15:37 · Revised 2026.9.2 13:01

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