n.半衰期(半衰变周期；半排出期)
The halflife of literature and core periodicales are approached as well. 对文献半衰期和核心期刊等作了探讨。
It is not necessary to wait until half of a sample has decayed in order to measure the halflife. 不必一直等到样品衰变一半之后才测量它的半衰期。
The elimination rate constant ( K e) of LCT ARF group was significantly less than that of LCT normal group,while the halflife period (t 1/2 ) of it was longer. LCT在肾衰组中的清除速率常数（Ke）明显小于正常组，半衰期（t1/2）则明显大于正常组。
The halflife periods of biodegradation of 20 organic pollutants in the Songhuajiang River were obtained through determination of the variation of the biochemical oxygen demand (BOD) with time with the standard test method. 采用标准测试方法测定了20种化合物在自然江水(松花江)中的生化需氧量(BOD)随时间的变化
radioisotope biological halflife 放射性同位素生物半衰期
[This message has been edited by halflife (edited 21 January 2002). 但是这里好象很少有人玩.
