1. Isn't the nonradioactive form of thallium used for rat poison? 铊的非放射性形态不是用于制造老鼠药吗?
2. How it works: A patient inhales haimless nonradioactive Xenon gas, which is tracked by a scanner as it enters the brain. 工作原理病人吸人无害的、无放射性的氙气。 氙气进人大脑后由扫描仪进行跟踪。
3. Some elements such as uranium, commonly used as fuel in nuclear power plants, are always radioactive; there is no nonradioactive form of them that naturally occurs in nature. 一些如铀一般的元素,通常在核电厂用作核燃料,都是有放射性的;这些元素由于自身的性质是没有无放射性状态的。