Where does computer radiation mainly come from?

Mainly from the keyboard! The second is the mouse, because these two have the most frequent contact with us! Or direct contact, the technology of today's monitors is actually very mature (referring to CRT), and the amount of radiation is completely controlled within a reasonable range. As for liquid crystals, there is almost no radiation.

Type "keyboard radiation" on Google, and 85,100 search results pop up after 0.2 seconds. After browsing through it, there are many posts such as "Keyboard radiation, sounding the health alarm!", "Computer radiation damages the most from the keyboard", "Choose a keyboard based on the issue of radiation", etc. Click to read the text. The description of "the greatest keyboard radiation" is even more "conclusive": keyboard 1000 volts/meter (the universal unit of measurement for electromagnetic radiation), mouse 450 volts/meter, screen 218 volts/meter, and host 170 volts/meter. rice. Could it be that the keyboard is really an overlooked source of computer radiation pollution?

The reporter’s question was “joked” by experts. Lin Zhihuang, business director of the Key Laboratory of Electromagnetic Compatibility of the Municipal Institute of Metrology and Testing Technology, said that even if they are all keyboards, the electromagnetic radiation generated by products from different manufacturers is also different. Putting the four different computer components of keyboard, mouse, screen and host together to compare is not a scientific attitude in itself. What's more, theoretically speaking, electronic products that consume more power have a higher probability of producing electromagnetic radiation. Among the four types of keyboard, mouse, screen, and host, it is obviously the host and screen that consume more power.

So, how did the testing data widely circulated on the Internet come about? Lin Zhihuang speculated that this may be the result of private testing by some college students who are interested in electromagnetic radiation issues. He told reporters that in some electronics malls, college students can easily buy a simple meter for testing electromagnetic radiation. Its front end is a sponge body with a small sensor built in. Once the measurer cannot treat the measurement distances of keyboard, mouse, screen and host equally, the results obtained will be far from the actual situation. "You know, as far as electromagnetic radiation is concerned, 1,000 volts/meter is a very astonishing magnitude. How could it come from a small keyboard?" Lin Zhihuang's explanation completely cleared the keyboard of its "crime."

Although there is no international conclusion on whether electromagnetic waves can harm human brain waves, Lin Zhihuang reminds consumers to look for the "3C" mark when purchasing electronic products. This mark indicates that the electromagnetic radiation generated by the product complies with national standards. Lin Zhihuang disagrees with the "folk recipe" that placing a pot of cactus in front of the computer can reduce radiation: "Unless you put an iron plate in front of you to reflect the electromagnetic waves back, you are only deceiving yourself."