放射|ほうしゃhousha[0]heiban (flat)

JLPT N1approx.Common
Definitions
  1. noun, suru verb, transitive verbradiation; emission
    The Doppler effect is also observed with light and with radiant energy in general.
Conjugation
Dictionary form放射する(ほうしゃする)
Polite (masu)放射します(ほうしゃします)
Negative (nai)放射しない(ほうしゃしない)
polite (masen)放射しません(ほうしゃしません)
classical zu / nu放射せず・放射せぬ(ほうしゃせず・ほうしゃせぬ)
Past (ta)放射した(ほうしゃした)
polite (mashita)放射しました(ほうしゃしました)
Past negative (nakatta)放射しなかった(ほうしゃしなかった)
polite (masen deshita)放射しませんでした(ほうしゃしませんでした)
Te form放射して(ほうしゃして)
Potential放射できる(ほうしゃできる)
Passive放射される(ほうしゃされる)
Causative放射させる(ほうしゃさせる)
Causative passive放射させられる(ほうしゃさせられる)
Conditional (ba)放射すれば(ほうしゃすれば)
tara放射したら(ほうしゃしたら)
Volitional放射しよう(ほうしゃしよう)
polite (mashou)放射しましょう(ほうしゃしましょう)
Imperative放射しろ(ほうしゃしろ)

Common forms generated by rule; see the senses for honorific or irregular usage.

Synonyms & antonyms
  • Synonym発散はっさんNeutralNoun for letting something disperse outward or venting feelings, as in 「ストレス発散」.
  • Synonym放出ほうしゅつNeutralNoun for release or discharge, as in 「エネルギーの放出」; general letting-out, not specifically radiation.
  • Synonym輻射ふくしゃNeutralNoun for radiation; still seen in set phrases like 「輻射熱」, but 「放射」 is the usual choice in general contexts.
  • Related放射線ほうしゃせんNeutralRefers to the rays themselves, as in 「放射線治療」; the emphasis is on the radiation emitted, not the act of emitting.
  • Related放射能ほうしゃのうNeutralThe ability or property of emitting radiation, as in 「放射能を持つ」; in loose usage also the radioactive material itself, as in 「放射能汚染」.
  • Related照射しょうしゃNeutralNoun for irradiation, as in 「レーザー照射」; the emphasis is on aiming rays at a target.
  • Related放散ほうさんWrittenWritten word for giving off or diffusing something, as in 「熱の放散」; rare.
  • Antonym吸収きゅうしゅうNeutralAbsorption — taking something in; the opposite of 「放射」.

Use 「放射」 for light, heat or electromagnetic waves given off from a center in all directions (「放射状」, 「放射冷却」). The rays themselves are 「放射線」, the property of emitting them 「放射能」, and aimed beams 「照射」; 「吸収」 is the opposite.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese definitions
  1. 中心ちゅうしんから線せん状じょうのものを四方しほう八方はっぽうに放出ほうしゅつすること。
  2. 電磁波でんじはや粒子線りゅうしせん、重力波じゅうりょくはなどを放出ほうしゅつすること。あるいは、放出ほうしゅつされたもの(=放射線ほうしゃせん)。
Kanji in this word
English equivalents
See also

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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