According to the website of the National Atomic Energy Agency, some high background areas in China are 3.7 millisieverts per year; Brick houses are 0.75 millisieverts per year; Cosmic rays are 0.45 millisieverts per year; Water, food, vegetables and air are 0.25 millisieverts per year; Soil 0. 1.5 mSv/ year; Chest fluoroscopy is 0.02 millisieverts at a time.
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The culprit of radiation comes from nature.
When it comes to radiation, people may first think of nuclear radiation. The atomic bombings in Hiroshima and Nagasaki have killed hundreds of thousands of people. The Chernobyl nuclear accident also caused a tragedy that shocked the world.
In fact, the biggest radiation hazard facing mankind comes from nature, that is, from the sky, underground and the surrounding environment of people's daily life. According to the research of American scientists, the average person in the United States receives 350 millirem of radiation from nature (the unit of cumulative radiation of human body) every year, of which only 40 millirem comes from cosmic rays.
John powys, director of the International Epidemiology Institute in Maryland, said, "What we eat, drink and breathe is low radiation." . Fred Mantler, director of the Department of Radiology, Medical College, University of New Mexico, also said that when you examine people who are exposed to radiation, you will find that about 2/3 people suffer from natural background radiation, and 15% is caused by medical equipment used by doctors. Other factors have little influence, and the radiation ratio of nuclear reactors and research institutions is even less than a few percent.
Radiation is the product of nature and human society. With the enhancement of environmental awareness all over the world, people will make continuous efforts to reduce radiation hazards, but it is by no means a day's work to completely eliminate radiation hazards.
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