radioactive impurity

例句：

1. 1. The sample was found to contain radioactive impurities that could be harmful to humans.
   该样本被发现含有可能对人类有害的放射性杂质。
2. 2.The research team used a special filter to remove the radioactive impurities from the water.
   研究团队使用一种特殊的过滤器来从水中去除放射性杂质。
3. 3. The scientist warned against using the contaminated water for drinking purposes due to its radioactive impurities.
   科学家警告不要使用受污染的水进行饮用，因为其含有放射性杂质。