원자핵의 자발적인 붕괴로 인해 전리 방사선이나 입자를 방출하거나 그와 관련된 성질을 가진.
Relating to or exhibiting the spontaneous emission of ionizing radiation or particles from unstable atomic nuclei.
예문:
"The researchers wore lead-lined suits while handling the radioactive material."
"Radon is a naturally occurring radioactive gas that can seep into homes from the ground."
"Proper disposal of radioactive waste is a major environmental challenge."