Common word› JLPT N1 › Freq. Frequency Top 5,000 Conjugation 放射する · noun or participle which takes 'suru'
Form Positive Negative Dictionary 放ほう 射しゃ する 放ほう 射しゃ しない Polite 放ほう 射しゃ します 放ほう 射しゃ しません Past polite 放ほう 射しゃ しました 放ほう 射しゃ しませんでした Past 放ほう 射しゃ した 放ほう 射しゃ しなかった Te-form 放ほう 射しゃ して 放ほう 射しゃ しないで Desire 放ほう 射しゃ したい 放ほう 射しゃ したくない Potential 放ほう 射しゃ できる 放ほう 射しゃ できない Passive 放ほう 射しゃ される 放ほう 射しゃ されない Causative 放ほう 射しゃ させる 放ほう 射しゃ させない Causative passive 放ほう 射しゃ させられる 放ほう 射しゃ させられない Volitional 放ほう 射しゃ しよう Polite volitional 放ほう 射しゃ しましょう Imperative 放ほう 射しゃ しろ 放ほう 射しゃ するな Conditional 放ほう 射しゃ すれば 放ほう 射しゃ しなければ Tara conditional 放ほう 射しゃ したら 放ほう 射しゃ しなかったら
Usage patterns 〈 物もの 〉 を 放ほう 射しゃ する to emit/radiate something (heat, light, particles, etc.)
The sun radiates heat and light.
〈 場ば 所しょ 〉 から 放ほう 射しゃ する to radiate out from a source or location
The device emits light radiating out from its center.
Related words 輻射 is an older, more technical physics term for the emission of radiant energy, largely interchangeable with 放射 in scientific writing.
放射 focuses on the act of emitting rays or particles outward, while 照射 emphasizes directing those rays onto a specific target.
放射 refers to radial emission or radiation (as in 放射線 ), while 射出 emphasizes a directed act of ejecting or injecting something.
Don't confuse with 放射 is the act or process of emitting radiation, while 放射線 refers to the actual rays or particles being emitted, and learners often blur the two because 放射線 is simply 放射 plus 線 .
放射 is the emission process itself, whereas 放射能 is the property of a substance that makes it capable of emitting radiation (radioactivity).
放射 means to emit or radiate energy outward, while 発射 means to launch or fire something like a missile or bullet, and the shared kanji 射 and similar sound make them easy to mix up.
Etymology A Sino-Japanese compound written with 放 , associated with releasing or sending out, and 射 , associated with shooting or emitting. The spelling transparently matches the modern meaning, but this is a component explanation rather than a detailed historical derivation.
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