放射性

A series from actinium to lawrencium of 15 radioactive ''.

15个从锕到铹的原子量递增的放射性元素。

The natural series are the thorium series, the uranium series, and the actinium series.

天然的放射性系是钍系、铀系和锕系。

A series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium.

15个从锕到铹的原子量递增的放射性元素。

A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead.

一种存在周期短的放射性金属元素，由铀形成，能分裂成锕然后分裂成铅。

All are radioactive heavy metals; and only the first four (actinium, thorium, protactinium, and uranium) occur in nature in appreciable quantities. The other 11 are unstable and are produced only artificially.

这些元素都是具有放射性的重金属；仅前四个元素是在自然界中存在的，其余十一个都不稳定且均为人造的。

Either of two decay products of thorium,mesothorium I,an isotope of radium,or mesothorium II,an isotope of actinium.

新钍钍的两种放射性生成物之一，即新钍1号，它是镭的同位素，或新钍2号，它是锕的同位素

Either of two decay products of thorium ,meso thorium I,an isotope of radium,or meso thorium II,an isotope of actinium.

新钍钍的两种放射性生成物之一，即新钍1号，它是镭的同位素，或新钍2号，它是锕的同位素

Atomic numbers from actinium to lawrencium.

15个从锕到铹的原子量递增的放射性元素。

An antibiotic that is derived from an actinomycete; used in treating infections of the urinary tract.

由放射性菌类制成的抗生素；用来治疗泌尿系统的传染疾病。

After affusion 3h ,125I-MT could be observed from feces of the calves in 125I-MT group and reached the peak（6.4673×10-2 mCi） at 33h.

结果表明：在灌喂125I-MT11h后，牛血液中放射性活度达最大值（0.6235×10-2 mCi）。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。