radium plaque

例句：

1. 1. The radium plaque was used to detect the presence of cancer cells in the body.
   放射性同位素标记物被用来检测身体内癌症细胞的存在。
2. 2.The researcher used a radium plaque to study the effects of radiation on living organisms.
   研究者使用放射性同位素标记物研究辐射对活体生物的影响。
3. 3. The radium plaque was crucial for the development of medical imaging techniques.
   放射性同位素标记物对于医疗成像技术的发展至关重要。