放射性同位素

Because a radioactive form of argon is produced by decay of a naturally occurring radioactive potassium isotope, it can be used to date rocks and samples more than 100,000 years old.

因为它是稀有天然放射性同位素钾衰变而产生的，所以可以用来测定十万年以上的岩石年龄和采样。属类：-〖化学

Foreman: Now, I'm injecting a material that's tagged with a radioactive isotope. It's gonna enter your spine and travel up to your brain. It'll make you able to think deep thoughts, at about 100 miles per hour.

福尔曼：我现在要给你注射一些混合了放射性同位素的物质，它将通过你的脊髓进入你的大脑，把你带入深度思考状态，大约每是小时推进100英里的速度。

Much consideration has however been given to the possibility that some atoms present in food might be converted to radioactive isotope s by the radiation.

人们更多考虑的是这样一种可能性，即食物中存在的一些原子经过辐照可能会转化为放射性同位素。

The article introduces recently some radioactive source accidents in China, and analyses the reasons of the accidents. Some important issues existed in the process of implementing new regulation were summarized, and some suggestions for managing radioactive sources are made.

本文通过介绍我国发生的一些放射源事故情况，分析事故发生的原因，总结了《放射性同位素与射线装置安全和防护条例》颁布后在实施过程中还存在的一些关键问题，提出了加强放射源管理的对策与建议。

Indeed the use of an electron beam or X-rays for irradiation overcomes the need for a radioactive source altogether.

用电子束或X-射线进行辐照确实完全解除了对某种放射源的需要。这个象炼狱般的地方将一缕致死的放射性同位素喷入大气层。

So, you know, I could separate radioactive isotopes.

那我就可以分离放射性同位素了。

Polyethylene glycol (MW6000 35%)-Ca〓(40mmol/l) system was applied to research on the fusion of nuclei and anucleated protoplasts which were deactivated by ultraviolet rays. The fusion process was verified by -dCTP radioisotope tracing with radioautography.

选择PEG6000促融，40mmol/1Ca〓进行了K氏酵母细胞核与His酵母经紫外线灭活的无核原生质体融合的研究，利用放射性同位素dCTP的示踪结合放射自显影技术，对融合进行检测，证实了融合的确实发生。

This approach seemed to work: radiocarbon dating of Taino posts has shown that they were in place for hundreds of years.

从考古证据看，这一推论应该是正确的：放射性同位素测定表明，那里的柱子已在原位牢牢竖立了好几百年，而更重要的是，那些木桩的树皮还好好的。

According to the technologies it takes, the enzyme activity detecting approaches could be divided into spectrophotometric and radiochemical assays.

根据使用的手段可分为放射性同位素标记法和分光光度法。

It will be an excellent alternative for instruments based on radioisotope or fluorescent-labeling techniques.

它应该是取代放射性同位素或荧光标签技术的另一个极佳选择。

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。