Even bananas contain trace amounts of a radioactive potassium isotope.

即使是香蕉都含有微量钾的放射性同位素。

And if scientists are also able to extract helium 3, an isotope that's believe to be in lunar soil they think that could be used to develop rocket fuel on the moon.

如果科学家也能提取氦3，一种据信存在于月球土壤中的同位素，他们认为这种同位素可以用来开发月球上的火箭燃料。

A radioactive isotope called tritium will remain in the waste water.

氚这种放射性同位素无法被清除。

That target includes an abundant isotope found in seawater and goes into a chamber about the size of a beach ball in the 60s, but is now a round room, 30 feet across with 192 massive lasers aimed at the center.

那个目标还包括在海水中发现的丰富同位素，并在60代放入一个大约沙滩球大小的空间，但现在是一个30英尺宽的圆形房间，有192个大的激光瞄准中心。

The answer lies in a slightly obscure but ingenious field known as isotope geochemistry.

答案在于同位素地球化学，这是个不大知名而又十分奇妙的领域。

The researchers demonstrated the corn plants' talent by exposing them to labeled isotopes of nitrogen.

研究人员让玉米接触带标记的氮同位素，以此来证明其才能。

I injected the stable isotope carbon-13 carbon dioxide gas.

我往他们的袋子中注射了 含有稳定性同位素碳13的二氧化碳。

Using radioactive isotopes, scientists discovered that trees share water and nutrients with others in need.

科学家利用放射性同位素，发现树木会分享水和营养给其他有需要的树。

The isotope experiments centered on the elements carbon and nitrogen.

同位素实验以碳和氮元素为中心。

A level of the hydrogen isotope called radioactive tritium will remain in the water.

一种被称为放射性氚的氢同位素会留在水中。

Johnson's team analyzed trace elements and carbon and oxygen isotopes in the hardened cave drippings.

约翰逊的团队分析了硬化洞穴水滴中的微量元素和碳氧同位素。

Tritium is an isotope of what element? - Hydrogen.

氚是哪个元素的同位素 -氢。

They were injecting rats with radioactive isotopes and one of the techs got bit.

他们给老鼠注射了放射性同位素 但其中的一名技术员被咬了。

I'm referring to the americium isotopes I was using to make a nuclear reactor.

我在说的是我当想拿来制造核反应堆的镅同位素。

Did you secure the isotope from L-Corp?

你安置好L公司的同位素了吗？

To try to link the evolution of these species with changes in the environment, Chu Xuelei of the Institute of Geology and Geophysics in Beijing and his colleagues have been looking at carbon isotopes in the Doushantuo rocks.

为了把这些物种的进化和环境变化联系起来，北京地质与地球物理研究所的储雪雷（音译）和他的同事用碳同位素方法测试陡山沱石块。

By measuring the abundance of that nitrogen isotope in this material, I can tell you that majestic old giants like this beauty here are actually composed of up to 85% material that's derived from salmon.

通过测量这种原料中氮同位素的丰度，我可以告诉你，那些雄伟非凡的古树，比如这一棵，实际上其构成成分中，有多达85%都是来自鲑鱼。

Tepco said for years that its purification system would reduce 62 radionuclides to safe or non-detectable levels and that only traces of tritium, a radioactive form of hydrogen, and two other isotopes would remain.

多来，Tepco声称其净化系统将把62种放射性核素降低到安全或不可检测的水平，只会残留微量的氚（一种放射性氢同位素）和其他两种同位素。

By comparing these isotopes to those known to have been in the ancient atmosphere, the researchers dated the slowly escaping water to be at least 1.5 billion years old, some of the oldest known.

通过将这些同位素与古代空气中已知存在的同位素比较，研究人员确认这些缓缓流出的水至少有 15 亿之久，有些是已知最古老的。

But all the other rocks we knew from elsewhere in the solar system which are meteorites that fall out of space, all have different oxygen isotope ratios.

但是我们掌握的来自太阳系其它地方的所有石块，那些从太空落下的陨石，都具有不同的氧同位素的比率。