1·Dmytro Melnychuk, rector of the national university, said: "Strontium-90, plutonium, and americium-241 are all extremely susceptible to upward atmospheric migration and dispersal via heat from fires."
国立大学校长Dmytro Melnychuk说：“锶- 90、钚还有镅- 241都是极易通过大火的高温向大气层上迁移和散播的。”
2·That essentially means that it uses a radioactive element called americium-241 to spot smoke or harmful gasses.
从字面上可以了解到，它采用放射性元素镅241来探测烟雾或者有害气体。