有效半衰期，是放射性核素因生物代谢与物理衰变共同作用而致在生物体内放射性活性降低到一半的时间。
抗甲状腺药物影响131i疗效的机理可能在于改变了131i的有效半衰期和(或)甲状腺对131i的摄取率。
Antithyroid drugs may influence the efficacy of 131i, the possible mechanism might be that antithyroid drugs change the effective half-time and (or) uptake of 131i.
目的：研究稳定态二氧化氯的稳定性能，并预测其半衰期及有效期。
Objective:To study stability of stable chlorine dioxide, and predict its half life and term of validity.
如果你能延长半衰期的雄骨架，稳定3位置并提供有效剂量，可以得到相同的结果，这是很该死的凉爽。
If you can prolong the half life of the androstane skeleton, stabilize the 3 position and give an effective dose, you can get the SAME results which is pretty damn cool.
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