roentgen apparatus

例句：

1. 1.The radium is used to treat cancer.
   放射线用于治疗癌症。
2. 2.The gamma rays are used in medical imaging.
   伽马射线用于医学成像。
3. 3. Photons are particles that can be detected by detectors.
   光子是可以通过探测器检测到的粒子。