Meaning and Usage
"放射" (ほうしゃ) primarily refers to the emission or radiation of energy, particles, or waves from a source. It is commonly used in scientific and medical contexts, especially relating to radiation such as X-rays, radioactive materials, or electromagnetic waves.
Common Collocations
- 放射線 (ほうしゃせん): radiation rays, often referring to X-rays or radioactive rays.
- 放射性物質 (ほうしゃせいぶっしつ): radioactive material.
- 放射エネルギー (ほうしゃエネルギー): radiated energy.
Usage Notes
When using "放射," the context usually involves physical emission processes. It is a formal term often found in technical or academic language rather than casual conversation. Learners should be careful not to confuse "放射" with "放す" (はなす), which means "to release" or "to let go," as they are unrelated despite similar pronunciation.
Register and Politeness
"放射" is a neutral to formal noun and is typically used in written or formal spoken Japanese, especially in scientific discussions or reports.