adj.非放射性的
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。
One drawback: a nonradioactive dye must be administered through the child's rectum before a CAT scan can be performed. 但是有一个缺点：在做CAT射线之前，必须用一种非放射性的染料给孩子的直肠染色。
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。
British chemist and physicist.He won a1922Nobel Prize for developments that led to the discovery of isotopes in nonradioactive elements. 阿斯顿，弗朗西斯·威廉1877－1945英国化学家及物理学家。他因在非放射性元素的同位素的发现过程中取得重大进展而获1922年诺贝尔奖
The Cerium-Tungsten electrode is nonradioactive and multifunctional.It possesses an excellent arcing feature and the arc current is low. 钨铈电极是一种非放射性、多用途的新型电极，它具有优良的电弧特性，维弧电流较小。
