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1·There are three naturally occurring radioactive series - the thorium series, the actinium series, and the uranium series.

有三个天然存在的放射系列，即钍系、锕系和铀系。

2·Radioactive leaks were detected after a series of explosions and fires at four of its six reactors following the failure of their cooling functions due to the damaged power supplies.

电力供应损坏导致反应堆冷却功能故障，为此六个核反应堆中的四个发生大火和一系列爆炸。随后核电站检测到核泄漏。

3·A large number of radioactive isotopes among the heavy elements are of three series.

重元素中的大量放射性同位素分别属于三个系列。

4·The large number of radioactive isotopes among the heavy elements fit into three series .

重元素中的大量放射性同位素分属于三个系列。

5·The truth of the secular equilibrium formula in radioactive cascade decay series is proved with the use of the Bateman formula.

提出了放射性递次衰变系列中存在的长期平衡公式的证明问题，指出该问题可以利用巴特曼公式来解决。

6·Radionuclide with long half-life causes radioactive contamination and produces a series impact on the ecosystem, threatens human health and survival of other bio-organisms.

放射元素半衰期长，放射性污染物进入土壤会危害农业生态环境，威胁人类的健康和其他生物的生存。

7·Factors influencing precise measurement of relative peak counting rates are discussed in time-series measurements over a dynamic range of 1000-fold radioactive intensities (10 half-lives).

对放射性强度跨越1000倍动态范围(10个半衰期)的跟踪测量中影响相对峰计数率精确测定的因素进行了讨论。

8·A radioactive transuranic element in the actinide series, artificially produced in trace amounts. Its longest-lived isotope is No255 with a half-life of3 minutes. Atomic number102.

锘在锕类元素中的一种放射性超铀元素，人工微量制造，其最长寿命的同位素是锘255，其。