这种原子通过释放射线从不稳定状态变到更加稳定的状态的过程被称为核衰减或放射。
The process by which an atom changes from an unstable state to a morestable state by emittingradiation is called radioactive decay or radioactivity.
物理学中流行的方法是从不带电的电子和原子核出发，因为它们是自由的平面波，可以具有任意能量，并在带电后衰减。
A view popular in physics is to start with uncharged electrons and cores, which are therefore both free and plane waves and can have any energy, and then fade in the charge.
本文针对火（核）电厂冷却水中余氯排放后的衰减规律和主要影响其衰减的因素进行了现场研究。
The residual chlorine variation in cooling water discharged from the Shidongkou Thermal Power Plant was measured by means of o-tolidine colorimetry.
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