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。

youdao

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。

youdao

The moon contains large concentrations of helium-3, a nonradioactive isotope that's rare on Earth but could be an incredibly valuable fuel for nuclear fusion.

FORBES: Magazine Article

Magnetic, nonradioactive nanoparticles (a tiny fraction of the thickness of a human hair and invisible to the human eye) are injected into the subject, where they bind only to known breast cancer cells within the body.

FORBES: Breast Exams: Mammography Is Not The Only Game In Town