Planetary scientists can determine a rock's age by calculating how many radioactive "parent" isotopes of a particular element have decayed into "daughter" isotopes.
行星科学家们可以通过计算一个特定元素有多少“母亲”放射性同位素衰变为“女儿”同位素来确定岩石的年龄。
They had been interested in thorium — a radioactive element that can fuel nuclear reactors but not be processed into weapons.
他们当时对一种放射性元素钍很感兴趣，这种元素能驱动核反应堆，却不能制造生产成武器。
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 radioactive transuranic metallic element discovered by bombarding with helium atoms.
一种放射性的金属元素在用氦原子轰击时发现。
A radioactive transuranic metallic element produced by bombarding with helium nuclei.
一种放射性超铀元素在用氦核子轰击时发现。
Radium is a radioactive element.
镭是一种放射性元素。
Radioactive Element Detected Near Nuclear plant.
核电站附近发现辐射性元素。
That essentially means that it uses a radioactive element called americium-241 to spot smoke or harmful gasses.
从字面上可以了解到，它采用放射性元素镅241来探测烟雾或者有害气体。
Radium is a radioactive element.
镭是个放射性元素。
By surveying the data, we concluded that the radioactive element contents are higher in the alteration zone, middle in the mixed granite and lower in the ore veins.
从实测结果可知，放射性元素在不同岩性中的含量以蚀变带最高，混合花岗岩次之，石英(矿)脉中最低。
Polonium is a highly radioactive element and a metalloid.
钋是高放射性的元素，金属。
Radon is a common radioactive element in air, which is strongly harmful to the man's health. Man inhales radon and its daughters mainly from the indoor air.
氡是空气中常见的放射性元素，其对人体健康有强的危害作用，人体主要从室内空气中吸入氡及其子体。
Each element has at least one isotope with unstable nuclei that can undergo radioactive decay.
每个元素至少有一个同位素不稳定原子核可以进行放射性衰变。
In nature, the element, whose nucleus is unstable and will grows to be nuclear of other element, is called radioactive element.
在自然界，凡原子核不稳定，过一些时间自发地变成其它元素原子核的元素，称为放射性元素。
The undisputed link between the tests and a radioactive element in baby teeth provided much of the impetus for the 1963 test Ban Treaty, which outlawed above-ground nuclear weapons-testing.
试验与婴儿牙齿里放射元素之间的无可争辩的联系对于推动1963年的《禁止核试验条约》起了至关重要的作用。该条约宣布地面进行核武器试验非法。
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。
A silvery, metallic synthetic radioactive transuranic element.
一种合成的银色放射性超铀金属元素。
In July 1898, Madame Curie and her husband got a great success that they discovered the radioactive element, polonium, which Marie named after Poland.
1898年7月，居里夫人和她的丈夫取得了一项极大的成就- - - - -他们发现了一种放射性元素，玛丽以波兰这一名称的字头命名它为钋。
Polonium is a naturally radioactive metallic element.
钋是一种具有天然辐射性的金属元素。
Because you have to know how much of radioactive element you have in those systems.
因为你必须知道有多少放射性元素在这些系统中。
The thyroid gland readily absorbs iodine in any form, (including radioactive iodine...) and it retains this element as a nutrient for extended periods.
甲状腺容易以各种形式吸收碘(包括放射性碘…)，并作为营养长期保留。
The thyroid gland readily absorbs iodine in any form, (including radioactive iodine...) and it retains this element as a nutrient for extended periods.
甲状腺容易以各种形式吸收碘(包括放射性碘…)，并作为营养长期保留。
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