One, Chernobyl nuclear power accident
Once the world's safest nuclear power plant, in April 26, 1986, leakage, Chernobyl No. 4 reactor in the half-baked experiments in the fire, caused by the explosion of the nuclear power generated by the radioactivity, equivalent to Japan's Hiroshima atomic bomb a hundred times. 8 tons of radiation leakage, dust floating with the wind to Russia, Belarus and Ukraine, bringing great pollution to the region. , Belarus and the Ukrainian region extremely contaminated.
Much good land has been contaminated, and 2.5 million people in Ukraine are suffering from various diseases as a result of the fallout from the leaks at the nuclear power plant. Among them were 473,000 children. The impact of the disaster on the natural environment will last at least 100 years, and the radioactive material will last for 100,000 years. The leakage from the nuclear power plant cost the thousand former Soviet Union up to 10 billion dollars.
Two, Three Mile Island nuclear accident
This is the most serious nuclear accident in the U.S., in the early morning hours of March 28, 1979, in the U.S. Harrisburg, Pennsylvania, southeast of the Three Mile Nuclear Power Plant's No. 2 Reactor, there was a radioactive material leakage, resulting in 80 kilometers around by nuclear contamination. The cause of the accident was the interruption of water supply to the secondary side of the steam generator due to the tripping of a water pump.
Three, Japan's Fukushima nuclear power plant accident
April 3, 2011, Japan's Fukushima Daiichi nuclear power plant, the No. 2 reactor building shell cracks, the main cause of a large amount of radioactive material leakage. The accident workers at the time, after sealing this 20-centimeter crack with cement, radioactive contaminants, still leaked out. The reason was that the cement was washed away by the constant flow of sewage. The amount of sewage discharged from the crack was four times the safety standard, and at first the nuclear power plant staff hoped to use a glue-like substance to seal the crack. But the sealing failed, resulting in the leakage of seven tons of radioactive wastewater, and two employees were sprayed with nuclear power effluent.
After the accident, TEPCO said it would take full responsibility for the nuclear leak. In fact, the same safety accident occurred at the Fukushima nuclear power plant back in 1978, but it was not publicized until 2007. After the accident, the 20 kilometers around the nuclear power plant were evacuated, and much of the radioactive material flowed into the Pacific Ocean, causing certain fish to mutate and retain radioactive material on their bodies.
Expanded:
p>The impact of nuclear radiation on people:
The general situation of nuclear leakage on the impact of personnel manifested in the nuclear radiation, also called radioactive substances, radioactive substances can be breathed in through inhalation, skin wounds and digestive tract absorbed into the body, caused by internal radiation, γ radiation can be penetrated a certain distance to be absorbed by the organism, so that the personnel suffered from external irradiation injury.
People exposed to nuclear radiation, nausea and vomiting within a few hours, and then diarrhea headache and other feverish symptoms. It is also possible to have an asymptomatic period, but after a couple of weeks more serious symptoms can appear. These symptoms may appear earlier in the case of higher radiation doses, and half of the healthy adults are not able to withstand a radiation dose of 4 gorey. The amount of radiation a person uses in radiation therapy is roughly 1-7 goreys. But it's highly controllable and works in a very small area.
The most dangerous thing about radiation is that it is carcinogenic, the rays cause cells not to turn into new cells, but only to produce a steady stream of cancerous cells. Some radiation is not cancerous, but it can change genes and cause the next generation to inherit, resulting in acute or severe congenital diseases in newborn babies.
Baidu Encyclopedia - Chernobyl Accident
Baidu Encyclopedia - Three Mile Island Nuclear Accident
Baidu Encyclopedia - Fukushima Nuclear Accident
Baidu Encyclopedia - Nuclear Radiation