放射性同位素

Radioisotope means the nuclide in a certain element with radioactive decay, which has the same ordinal number of atoms but different mass.

放射性同位素，是指某种发生放射性衰变的元素中具有相同原子序数但质量不同的核素。

Group in the periodic table there are silver-white metallic luster of the solid metal transition element, atomic number Z = 26, atomic weight of 55847, chemical symbol Fe, there is a stable F isotope 5626Fe and a radioisotope 5526Fe, content of 5% of the earth's crust, accounting for elements of in the fourth place, the metal in the second melting point 1535 ℃, boiling point 2750 ℃, the relative density of 786, the external electronic structure 3d64s2, chemical reactions 2-6 tram F-volatile son, oxidation number of 0, 2, 3, 4 , 5 and 6, the chemical nature of the metal element is very lively, in the humid air combined with oxidation, but also directly with the sulfur, phosphorus, silicon, carbon together.

周期表中Ⅷ族有银白色金属光泽的固体金属过渡元素，原子序数Z＝26，原子量55847，化学符号Fe，有一种稳定F同位素5626Fe和一种放射性同位素5526Fe，地壳中含量5％，占元素中第四位、金属中第二位熔点1535℃，沸点2750℃，相对密度786，外围电子结构3d64s2，化学反应时易丢失2—6个电F子，氧化数为0、＋2、＋3、＋4、＋5和＋6、化学性质很活泼的金属元素，在潮湿空气中能与氧化合，也能直接与硫、磷、硅、碳化合。

The importation of the radioactive isotope, radiation equipment and other radioactive materials should come up to applicable state regulations.

进口放射性同位素、射线装置和含有放射性物质的物品的，按照国家有关规定办理。

A radioactive isotope of iodine widely used as a tracer in medical diagnosis .

放射性碘碘的一种放射性同位素，广泛地用于医学诊断作为追踪剂

A radioactive isotope gradually loses its radioactivity and decays over time into the normal form of the substance.

放射性同位素逐渐丧失放射性，并逐渐衰变成该物质的正常形式。

"What it amounts to," said Billings,"is that The Goose can convert any radioactive isotope into a stable one..."

"也就是说，"比林斯说道，"这只鹅能够把任何放射性同位素转变成稳定的同位素。。。。。。"

Distinguish by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions.

用放射性同位素或不寻常质量的同位素使元素或原子显示运动踪迹。

As a tracing agent , the radioactive isotope has a high sensitivity for detection.

放射性同位素作为示踪剂，其检测灵敏度高，在染色和盐类示踪剂不能奏效的情况下，放射性示踪剂都能得到成功。

The intensity of a radioactive source.

辐射出射线的同位素被为放射性同位素。

Accelerators are also used for radioisotope production, cancer therapy, Biological sterilization, and one form of radiocarbon dating.

加速器也用于制造放射性同位素、治疗癌症、生物消毒及放射性碳定年。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。