X-ray proportional counter

例句：

1. 1. The X-ray proportional counter is used to detect the presence of bone fractures in patients with osteoporosis.
   X射线比例计用于检测骨质疏松症患者的骨骨折情况。
2. 2. The X-ray proportional counter was designed to provide a more accurate measurement of bone density.
   X射线比例计被设计用来提供更准确的骨密度测量。
3. 3. The X-ray proportional counter was used to measure the thickness of the patient's skin.
   X射线比例计被用来测量病人皮肤的厚度。