为了探测质子衰变放射性的假想形式，人们修建了巨大的探测器，但这些探测器从没发现这种东西。
Giant detectors built to look for a hypothetical form of radioactivity in which protons decay never found such a thing.
地质年代通常是通过矿物中发现的各种放射性元素的衰变率来获得的。
Geological dates are usually obtained by using the rates of decay of various radioactive elements found in minerals.
地质年代通常是通过矿物中发现的各种放射性元素的衰变率来获得的。
Geological dates are usually obtained by using the rates of decay of various radioactive elements found in minerals.
氦是钍和铀元素数千年放射性衰变的副产品。
Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.
然而，大约在同一时间，科学家们意识到彗星可能含有衰变的放射性同位素，这些同位素可能使彗星内部的温度升高到导致内部进化的温度。
About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve.
这些矿物可以用放射性衰变技术测定年代，因为它们所含的放射性微量元素非常少。
These minerals can be dated by radioactive decay techniques because of the very small quantities of radioactive trace elements they, in turn, contain.
法扬斯和索迪的放射性位移定律被用来描述α和β衰变的产物。
The radioactive displacement law of Fajans and Soddy was formulated to describe the products of alpha and beta decay.
一旦反应堆关闭，它仍热存在有来自其他放射性同位素踪迹的衰变热。
Once the reactor has shut down, there remains "decay heat" from traces of other radioactive isotopes.
这项实验的关键因素在于放射性衰变是一个量子过程。
The point of the experiment is that radioactive decay is a quantum process.
只有重力和一种可以支配某些放射性衰变的弱核力能够使其聚集凝固，“弱反应”这一术语由此得名。
Only gravity and a phenomenon called the weak nuclear force, which governs some types of radioactive decay, can bind them—hence the term “weakly interacting”.
但是，相对于仅使用一个方法测试放射性衰变，研究人员测定时使用了三种元素，铅，钐，钕。
But rather than test the radioactive decay using just one method, the researchers used three, involving the elements lead, samarium and neodymium.
氡子核在衰变时发射出放射性阿尔法粒子，这些粒子可附着于空气中的浮质、灰尘及其它粒子。
As radon progeny decay, they emit radioactive alpha particles and attach to aerosols, dust and other particles in the air.
行星科学家们可以通过计算一个特定元素有多少“母亲”放射性同位素衰变为“女儿”同位素来确定岩石的年龄。
Planetary scientists can determine a rock's age by calculating how many radioactive "parent" isotopes of a particular element have decayed into "daughter" isotopes.
这个模型的核心是延伸型指数函数的松弛效应，就像放射性物质的衰变曲线一样。
The core of this model is a function called a stretched exponential relaxation, which is similar to the decay curve of a radioactive material.
没人知道中微子中微子是如何同放射性材料发生作用并改变他们的衰变速率的。
No one knows how neutrinos could interact with radioactive materials to change their rate of decay.
阿尔法粒子是氦核，它们是放射性衰变的产物。
Alpha particles are these helium nuclei, and they are the result of radioactive decay.
在海洋的大部分区域，海床都由厚重的粘土构成，最适合吸收放射性衰变产物。
Inlarge parts of the ocean, the seafloor is made of thick, heavy clay, perfectfor absorbing radioactive decay products.
食品中的放射性碘直接引起人们的关注，但是它的半衰期相对较短并将在短时间内自然衰变。
Radioactive iodine in food is of immediate concern, but it has a relatively short half-life and will naturally decay over a short time frame.
量子隧穿发生在许多的物理过程中，比如说放射性衰变和太阳上发生的核聚变。
Quantum tunneling is involved in many physical processes, such as radioactive decay and the nuclear fusion that takes place in the Sun.
原子通过辐射由不稳定状态转变为更加稳定状态的过程称为放射性衰变或放射性。
The process by which an atom changes from an unstable state to a more stable state by emitting radiation is called radioactive decay or radioactivity.
之所以称其为“弱作用”，是为了指出粒子受到四大基本力中的另一种——由放射性衰变所产生的弱核力（四大基本力是：引力、电磁力、强力、弱力）。
By calling them “weakly interacting”, physicists mean that the particles experience another of the four fundamental forces, namely, the weak nuclear force that is responsible for radioactive decay.
假定我们有某种放射性原子，它们以一定的几率衰变。
Suppose we've got some sort of radioactive atom, which has a certain chance of decaying.
在中间尺度上，量子效应偶尔会被放大以致可被观察到，例如我们在测量放射性衰变的时候。
At an intermediate scale, however, they areoccasionally amplified to become observable, for example when wemeasure radioactive decay.
放射性碘的半衰期为八天，几周内自然衰变。
Radioactive iodine has a half-life of eight days and decays naturally within weeks.
这种超重元素通常是具有非常强的放射性，并且几乎立即会发生衰变。
Such superheavy elements are usually very radioactive and decay away almost instantly.
有些核裂变产生的副产品自身具有放射性。这些物质的衰变，也在产生热能。
Some byproducts of the nuclear fission are themselves radioactive.These decay, producing heat.
最为有名的就是铀- 238衰变为铅- 206的半衰期为45亿年，当然放射性铷和钐也同样对测算几十亿年前的物体的年龄很有用。
Most famously, uranium-238 decays into lead-206 with a half life of 4.5 billion years, though radioactive rubidium and samarium are also useful for dating things billions of years old.
普渡大学物理教授EphraimFischbach，将探测几种同位素的放射性衰变速率的方法作为一种没有人为输入因素干扰的产生随机数的可能方法。
Ephraim Fischbach, a physics professor at Purdue, was looking into the rate of radioactive decay of several isotopes as a possible source of random numbers generated without any human input.
普渡大学物理教授EphraimFischbach，将探测几种同位素的放射性衰变速率的方法作为一种没有人为输入因素干扰的产生随机数的可能方法。
Ephraim Fischbach, a physics professor at Purdue, was looking into the rate of radioactive decay of several isotopes as a possible source of random numbers generated without any human input.
应用推荐