放射

1. Origins, structure, and basic meaning

• Structure: 放射 is read as ほうしゃ and functions as a noun or with する for heat, light, or energy spreading or being emitted outward from a source.
• Basic usage: Mark the source with から in 太陽から放射される and the outward direction with へ in 四方へ放射する.

2. Common pitfalls and similar expressions

• Passive and active forms
  • Heat is described with the passive 放射される, while a device actively emits an object in 光を放射する.
• Translate according to what is emitted
  • Natural English may use radiation for heat and emission for light, depending on the substance or energy involved.