About 100 years ago, scientists discovered that certain substances can emit three kinds of rays: alpha rays, beta rays and gamma rays, collectively called electromagnetic radiation.
The radiation is colorless and tasteless, silent and odorless, invisible and untouchable. However, radiation can be detected and measured with instruments. The unit of measurement of radiation dose is Sievert, abbreviated as Sie. One millisie is equal to one thousandth of a Greek.
Radiation is everywhere. The food we eat, the houses we live in, the sky and the earth, the mountains and the trees, and even the human body are radioactive. According to the website of the National Atomic Energy Agency, some high-background areas in China are 3.7 mSv per year; brick houses are 0.75 mSv per year; cosmic rays are 0.45 mSv per year; water, food, vegetables, and air are 0.25 mSv per year; and soil is 0.15 mSv per year. ; Chest fluoroscopy once 0.02 mSv.
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