Kara, we calculated the rate of radioactive decay.

卡拉 我们计算过放射衰变率。

They're produced in your body from the radioactive decay of potassium.

你的体内的钾的放射性衰变会产生中微子。

Glad to see we got so many people interested in radioactive decay.

很高兴看到有这么多人对放射性衰变感兴趣。

They're produced by nuclear reactions inside the sun and by radioactive decay inside the Earth.

太阳中的核反应和地球内部的放射性衰变都能产生中微子。

Their age can be found by looking at ratios of elements in them formed from radioactive decay.

它们的年龄可以通过观察由放射性衰变形成的元素的比例而发现。

This is possible because the two nuclides break down at different rates, through the process of radioactive decay.

这是可能的，因为这两种核素在放射性衰变过程中以不同的速率分解。

Some of this heat comes from the radioactive decay of metals.

其中一些热量来自金属的放射性衰变。

The second type of radioactive decay is beta decay, which simply emits electrons.

第二种类型的放射性衰变是 β 衰变， 它只是发射电子。

Finally, 0.93% of our air is argon, a molecule formed from the radioactive decay of potassium in Earth's atmosphere, crust, and core.

最后，我们的空气有 0.93% 是氩。氩是地球大气、地壳，及地核中的钾经过放射性衰变产生的分子。

When a nucleus decomposes in this way to form a different nucleus that's radioactive decay.

当一个原子核以这种方式分解形成另一个不同的原子核时， 它就是放射性衰变。

Now radioactive decay occurs when a nucleus has a higher energy level than a potentially more stable version.

现在，当原子核的能级高于可能更稳定的核能级时， 就会发生放射性衰变。

Those electrons come from a source like sunlight or the natural radioactive decay of elements in the ground.

这些电子来自太阳光或地下元素的自然放射性衰变等来源。

Finally, we discussed the three major types of radioactive decay: alpha, beta, and gamma.

最后，我们认识了三种主要的放射性衰变：alpha、beta、gamma衰变。

You also learned about different types of radioactive decay: alpha, beta, and gamma.

您还了解了不同类型的放射性衰变：α、β 和γ。

This detector is extra good at measuring particles that form after smashing protons together, and their radioactive decay products.

该探测器特别擅长测量质子碰撞后形成的粒子及其放射性衰变产物。

But heat from radioactive decay moves so slowly through solid rock that taking radioactivity into account only improves Kelvin's estimate by...pretty much nothing.

但放射性衰变产生的热量在固体岩石中的移动速度很慢，将放射性考虑在内，只能使 Kelvin 的估计值提高… … 几乎没有提高。

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.

海量的地球诞生余热以及数万亿吨的放射性元素除了向上以外没有其他的逃脱方向。

There are three general types of radioactive decay, each named for exactly what is released from the nucleus as it decays.

放射性衰变分为三种一般类型，每一种都以原子核衰变时释放的确切物质命名。

93% of our air is argon, a molecule formed from the radioactive decay of potassium in Earth's atmosphere, crust, and core.

我们空气中 93% 是氩气，这是一种由地球大气、地壳和地核中钾的放射性衰变形成的分子。

Last week we talked about radioactive decay and how atomic nuclei get rid of various particles in order to become more stable.

上周我们讨论了放射性衰变以及原子核如何摆脱各种粒子以变得更加稳定。