Curie soon found that the element thorium emitted similar radiation.

居里现元素会出类似的辐射。

Even though the thorium emits an electron we don't use the usual symbol for electrons.

即使射电子， 我们也不使用通常的电子符号。

Using traces of two other elements, uranium and thorium, they were able to date both stalagmites.

利用这两种其他元素的痕迹，他们能够确定这两种石笋的年代。

All this background radiation comes from radon in the air and uranium and thorium in the soil.

所有这些背景辐射都来自空气中的土壤中的。

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

伽马射线的能量是光的最高能量形式，相当于放射性元素。

The helium nucleus obviously has a plus 2 charge, and the thorium atom would have a negative charge as well.

氦原子核显然带有正 2 电荷， 而原子也带有负电荷。

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

这些流石的年龄可以通过其中放射性元素的比例来确定。

Her studies on uranium and thorium led her to deduce that the radiation they emitted was not due to interactions with other elements but was an inherent property of the elements themselves.

她对的研究使她推断出它们出的辐射不是由于与其他元素的相互作用而产生的，而是元素本身的固有属性。

So for example, if that uranium atom is at an excited state when it decays in to thorium, it can simultaneous release gamma waves as well as the alpha particle I already mentioned.

因此，例如，如果原子在衰变成时处于激态，它可以同时释放伽马波以及我已经提到的阿尔法粒子。

The Earth's Inner Furnace Earth's internal heat originates from two primary sources: residual heat from the planet's formation around 4.5 billion years ago and heat produced by the decay of radioactive elements like uranium, thorium, and potassium.

地球的内部熔炉 地球的内部热量有两个主要来源：大约 45 亿年前地球形成时的余热，以及、钾等放射性元素衰变产生的热量。

" It was one of these oddball places that just stood out like a sore thumb in terms of the thorium abundance, " said Dr. Lawrence, now a planetary scientist at the Johns Hopkins Applied Physics Laboratory in Maryland.

“这是一个奇怪的地方，在丰度方面非常突出，”劳伦斯博士说，他现在是马里兰州约翰·霍普金斯大学应用物理实验室的行星科学家。