Radioactive iodine in food is of immediate concern, but it has a relatively short half-life and will naturally decay over a short time frame.
食品中的放射性碘直接引起人们的关注，但是它的半衰期相对较短并将在短时间内自然衰变。
Most famously, uranium-238 decays into lead-206 with a half life of 4.5 billion years, though radioactive rubidium and samarium are also useful for dating things billions of years old.
最为有名的就是铀- 238衰变为铅- 206的半衰期为45亿年，当然放射性铷和钐也同样对测算几十亿年前的物体的年龄很有用。
The city's challenge, chiefly, is to dispose of cesium-137, a radioactive isotope with a half-life of 30 years.
这座城市面临的最大问题就是处理铯—137，这是一种半衰期为30年的放射性同位素。
Radioactive iodine has a half-life of eight days and decays naturally within weeks.
放射性碘的半衰期为八天，几周内自然衰变。
Unlike radioactive iodine, which has a short half life, cesium lingers in the environment.
碘驻留期短一半，而铯则悬浮在环境中。
This radioactive element has a half-life of some 5, 700 years.
这种放射性元素半衰期约为5700年。
A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens.
一种碳的天然放射性同位素，原子量为4，半衰期为5，780年，用于测定古代生物标本，地质标本或考古遗迹的标本的年代。
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。
Such a short half-life to facilitate the treatment of the operation, but also easy to play a role in radioactive antibody.
如此短的半衰期便于治疗操作，也便于放射性抗体发挥作用。
A radioactive, inert, gaseous isotope of radon, with a half - life of3.92seconds.
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。92秒。
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。
When common cobalt (59Co) absorbs a neutron the result is 60Co, which is radioactive and has a half-life of more than five years.
当普通钴（59Co）吸收了一个中子后生成的是相对原子量60的钴。钴60有放射性且半衰期超过五年。
When common cobalt (59Co) absorbs a neutron the result is 60Co, which is radioactive and has a half-life of more than five years.
当普通钴（59Co）吸收了一个中子后生成的是相对原子量60的钴。钴60有放射性且半衰期超过五年。
应用推荐