radioactive sensor

例句：

1. 1. The scientist detected the presence of radioactive materials in the sample.
   科学家在样本中检测到了放射性物质。
2. 2. The area around the reactor is considered to be radioactive due to the high levels of radiation.
   由于高辐射水平，反应堆周围的区域被认为是放射性的。
3. 3. The research team used a special device to measure the amount of radioactive material in the environment.
   研究团队使用了一种特殊设备来测量环境中的放射性物质含量。