| 词汇 | 放射性 |
| 释义 | 放射性 The radiation radius of the radioactive radium radiator in the stadium is variable. Radioactive iodine loses half its strength in a week. However, unlike the simple exponential that describes radioactivity, which has only one variable, a stretched exponential describes a process controlled by several independent factors. But the pills are not a cure for radiation sickness. And they work only if the radioactive iodine has been taken into the body through food or drink. But it depends on the depth of the radioactive material. As the heat diminishes, radioactive materials that have vaporized condense on the particles and fall back to Earth. Authorities said there was no radioactive leak, but critics urged France to rethink its nuclear power in the wake of the catastrophe at Japan’s Fukushima plant. For most people more than half of their natural background radiation dose comes from radon, a radioactive gas that can accumulate in homes, schools and workplaces. What is the danger level for humans and radioactivity? The other radioactive material often in the cooling water of a nuclear reactor is tritium. The fireball and mushroom cloud carry radioactive particles upward, and the wind sends them near and far. Madame Curie was the physicist with expertise in chemistry that, in1898, discovered the radioactive substances of radium and polonium in Paris, France. The ideal nanocomposite would not only resist radiation damage. It would also not itself become radioactive by absorbing neutrons. Without galactic assistance, I know of no other way to address the radioactive fallout problem. Radioactive caesium-137 also appeared in one of the samples, but at levels below the legal limit. Small amounts of radioactive vapor were expected to be released into the atmosphere to prevent damage to the containment systems, safety officials said. Now the Japanese are screening all fish products, some of which do indeed have high levels of radioactivity, and health officials there have set a radiation safety limit on seafood consumption. A VOA reporter talked to people at a Little League game on Sunday and found that none of them knew about the radioactive hot spot. Then she found that pitchblende was more radioactive than uranium by itself. Steam, contaminated with some radioactive elements, flowed out of the pressure vessel and into the larger containment vessel that surrounds it. His team could work close to the reactor. In Japan it may well be too dangerous to do so because of high levels of radiation. The point of the experiment is that radioactive decay is a quantum process. |
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