And he was poisoned by radioactive polonium. He died the slow agonizing death in 2006.

他被放射性钋毒杀。在2006年缓慢又痛苦地死去。

British officials said they added radioactive polonium to his tea.

英国官员称他二人在利特维年科茶中放入了放射性钋。

It was being warmed by radioactive elements in the granite that formed in the solidified magma chamber below.

在下面凝固岩浆腔中花岗岩中放射性正在给它加热。

Everywhere are traces of the sudden appearance of rare radioactive elements like plutonium, a legacy of nuclear weapons.

到处都有迹可循是诸如核武器或燃料等设备中才涉及到钚这类放射性突然微量出现。

Since Mars doesn't have easily accessible radioactive elements, the nuclear fuel needs to come from Earth along with the reactor.

由于火星没有易获得放射性，核燃料和反应堆均需要来自地球。

So, were there other radioactive elements that might be responsible?

那么，是否还有其他放射性可能对此负责？

Neutrinos are subatomic particles produced when radioactive elements decay.

中微子是放射性衰变时产生亚原子粒子。

Let's take a look at what may be the most famous radioactive element, uranium.

让我们来看看最著名放射性是什么。

Bismuth is interesting because it is the heaviest element that is not radioactive.

铋很有趣， 因为它是最重非放射性。

As a radioactive element decays, the individuals atoms split into multiple, but when that happens the reaction also releases energy.

当放射性衰变时， 单个原子分裂多个原子，但当这种情况发生时， 反应过程中也会释放能量。

Let’s start off with another scientist who worked with radioactive elements -- Lise Meitner.

让我们从另一位研究放射性科学家开始——Lise Meitner。

The energy of the gamma-rays, the highest energy form of light, corresponded to thorium, a radioactive element.

伽马射线能量是光最高能量式，相当于放射性钍。

Like her mother, Irene was awarded a Nobel Prize, along with her husband Frederic in 1935, for producing new radioactive elements.

和她母亲一样，艾琳于1935年，与他丈夫弗里德里克，因创造了新放射性，共同获得了诺贝尔奖。

The greatest challenge for a nuclear reactor is to safely contain these products and keep them from harming humans or the environment.

对于一个核反应堆最大挑战就是安全存储这些放射性并使它们不能伤害到人类与自然。

Well it's fairly simple, given enough time all radioactive elements would decay in to non radioactive forms.

好吧，这很简单，只要有足够时间， 所有放射性都会衰变非放射性式。

The ages of these flowstones can be determined by the ratio within them of the radioactive elements uranium and thorium.

这些流石年龄可以通过其中放射性和钍比例来确定。

It wasn't until the mid-20th century we realized that radium's harmful effects as a radioactive element outweighed its visual benefits.

直到 20 世纪中叶，我们才意识到镭作为一种放射性有害影响超过了它在视觉上好处。

Titanic amounts of heat left over from its birth and the radioactive decay of trillions of tons of radioactive elements find no escape but up.

海量地球诞生余热以及数万亿吨放射性除了向上以外没有其他逃脱方向。

Perhaps the most transformative element of Curie's work was the discovery of two previously unknown radioactive elements—Polonium, named after her beloved Poland, and Radium.

也许居里夫人工作中最具变革性是发现了两种以前未知放射性——钋（以她深爱波兰命名）和镭。

She added that she wasn't told about the danger of radiation, stating, " About radiation, that radioactivity was escaping, there was not a word" .

她补充道，她没有得到通知有核辐射危险，她说，" 核放射性正在蔓延，但没有人提到一个字。"