It has a half - life of about 41 / 2 billion years.

它的 半衰期 大约为45亿年.

辞典例句

The half - life of francium is 22 minutes.

钫的半衰期是22分钟.

辞典例句

A radioactive, inert, gaseous isotope of radon a half - life of 3.92 seconds.

氡的一种放射性的, 惰性的和气态的同位素,其半衰期为3.92秒.

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It retained 50 % of its ini - tial activity after 50 recycles of applications.

活力的半衰期为重复使用50次.

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The half - life of humic acid is measured in centuries.

腐殖酸的半衰期是几个世纪.

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A radioactive, inert, gaseous isotope of radon, with a half - life of 3.92 seconds.

锕射气氡的一种放射性的, 惰性的和气态的同位素, 其半衰期为3.

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Tritium has a half - life of 12.4 years.

氚的半衰期为12.4年,地球形成时的氚早已不存在.

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Mutagenesis library is developed for identifying key residues of protein, raising the affinity and prolonging half - lif.

蛋白突变库主要应用于提高蛋白亲和力、延长 半衰期 、确定蛋白关键残基.

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The drug acts only in the brain, claims Lynch. It has a short half - life of hours.

加里·林奇说,药物只在大脑里发生作用, 而且只有短暂的几个小时的 半衰期.

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Even Francium's most stable isotope, Francium - 223 only has a half - life of 22 minutes.

钫的最稳定的同位素, 钫 -223 也只有22分钟的半衰期.

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Theresults showed that the pharmacokinetics of ENC conformed with one compartment open model.

结果表明其符合一室模型,且口服吸收迅速,消除半衰期短,分布容积大.

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