What are the dangers of nuclear radiation?

　　In daily life, people are often exposed to various types of radiation, and different radiation doses have different effects on the human body. When the short-term radiation dose is less than 100 millisieverts, there is no harm to the human body. When it is higher than 4000 millisieverts, it is fatal to the human body.

　　In radiation medicine and human radiation protection, people use the sievert as the international unit to measure the damage of radiation to biological tissues. A sievert is a very large unit, so people usually use millisieverts and microsieverts. 1 millisievert is equal to 1000 microsieverts. For people who are not often exposed to radiation in their daily work, normal natural radiation (mainly radon radiation in the air) is 1,000 microsieverts to 2,000 microsieverts per year.

　　When the short-term radiation intake is less than 100 millisieverts, there is no harm to the human body. If this number exceeds 100, it will cause harm to the human body.