CT, talk about it.

Any discussion of toxicity without dose is hooliganism. First of all, our bodies are basically healthy, and it is impossible to go to the hospital for CT every day. Secondly, as a means of diagnosis and treatment, CT manufacturers will consider the possible harm to the human body when designing. Therefore, in actual use, manufacturers will set up a large number of safety measures to prevent radiation damage to the human body. Finally, CT has radiation, but the dose of this radiation is not high and will not affect people's health.

First, let's talk about what radiation is. Radiation is a high-energy particle beam. General radiation is divided into ionizing radiation and electromagnetic radiation. Another name for electromagnetic radiation is electromagnetic wave. We use mobile phones to communicate, watch TV, use computers and use WIFI to generate electromagnetic radiation. Electromagnetic radiation is harmless to human body. Recently, many news reports have reported that some old men and women maliciously destroyed the base station for fear that it would radiate. The radiation produced by the base station is actually electromagnetic radiation, which is completely different from ionizing radiation. After all, the base station is just a signal tower, not a nuclear reactor.

The principle of CT is to penetrate the human body with X-rays, and then form an image of the inside of the human body. So CT will produce ionizing radiation. We can all see the placard "Beware of ionizing radiation" at the door of the hospital CT room. Every time the human body receives CT examination, the maximum radiation dose is 1-2 millisieverts. This radiation dose is quite small and can be ignored. When the CT machine is turned off, the radiation does not exist. Therefore, a CT scan is not too harmful to the body. On the contrary, doctors can judge your cause as soon as possible through the results of CT. Give you better treatment.

Our fear of radiation comes from three events. First, the United States bombed Japan with atomic bombs. Second, the Chernobyl nuclear accident in the Soviet Union. Third, the Fukushima nuclear accident in Japan. These three nuclear accidents have created a considerable air force for nuclear radiation. But all fears come from the unknown, and it is precisely because I don't understand nuclear radiation that I feel that nuclear radiation is terrible.

First of all, radiation is everywhere in our daily life. Let's start with our sun. Nuclear fusion continues to occur on the surface of the sun. Everyone can understand that hydrogen bombs are constantly exploding on the surface of the sun. Because the temperature and pressure on the surface of the sun are enough, the nuclear fusion reaction of hydrogen bombs can continue all the time. We all know that sunlight has a spectrum, with red light at one end and purple light at the other. Purple light has a short wavelength and red light has a long wavelength. All of the above are visible light, besides red light, there are infrared light, and besides violet light, there are ultraviolet light. Both are invisible light. Besides infrared rays, there are also radio waves and microwaves. These are all electromagnetic radiation that is harmless to human body.

If the wavelength of electromagnetic radiation is less than 100 nm, ionizing radiation will be formed. For example, X-rays, gamma rays and so on are ionizing radiation. Long-term and high-dose ionizing radiation exposure will lead to canceration of human cells. But the premise is that the dose is large and the time is long. Short-term CT irradiation will not cause problems.