detector of tritium contamination

例句：

1. 1.The scientist used a detector to detect the presence of radiation.
   科学家使用一个探测器来检测辐射的存在。
2. 2. The new detector is much more sensitive than the old one.
   这个新型的探测器比旧的要敏感得多。
3. 3.The detector picked up a faint signal from the other side of the room.
   探测器从房间的另一侧捕捉到了微弱的信号。