The unit of electromagnetic radiation in the power frequency range is uT (micro Tesla). If the radiation is above 0.4uT, it belongs to strong radiation and has certain harm to the human body. Long term exposure is prone to leukemia. If the radiation is below 0.4uT, it is relatively safe.
Television
The traditional CRT for picture tube television was the first to be tested. We first conducted a close-up test on it. Within a range of half a meter from the front, the radiation value generated by it at the moment of normal startup is 0.12uT, the radiation value during normal viewing is 0.30uT, the radiation value during channel switching is 0.27uT, and the standby state is 0.11uT. However, under normal viewing on the side, the radiation value is 0.28uT, which is generally close to the warning value.
Looking at the plasma TV again, half a meter from the front, the power on, viewing, and channel changing are all 0.11uT, 0.12uT in standby, and 0.11uT on the side; At a distance of 3 meters from the front, the plasma radiation intensity is 0.12uT when turned on, 0.14uT when viewed normally, and 0.11uT when switching channels or in standby mode. From the test results, compared to traditional televisions, the plasma radiation intensity is lower.
When watching a rear projection TV normally, it should be tightly attached to the front of the body for 0.12uT, the side for 0.19uT, and the back for 0.14uT; 0.11uT at half a meter from the front; 0.1uT at 3 meters from the front.
The most reassuring aspect of the TV series is the LCD TV. Whether within a range of half a meter or three meters from the front, the test results for instant startup, normal viewing, channel switching, and standby mode are all 0.1uT, while the side is only 0.11uT, basically indicating no change in radiation intensity.
Test results: After comparing the three types of TVs, it is not difficult to find that LCD TVs and rear projection TVs have the smallest radiation, plasma TVs have slightly stronger radiation, and CRT TVs are larger, but mainly behind the TV. It is recommended to maintain a certain distance when watching, especially for children.
DVD player and home theater
That is to say, the DVD player and audio system are closely tested, with DVD1.2uT, OK player 1.2uT, amplifier 1.24uT, small speaker 1.5uT, and large speaker 0.49uT. If turned on at the same time, the radiation can be significant.
Tip: It is recommended that you use home theaters as little as possible. If you want to sing, it is best to go to KTV.
Computer
People have always believed that CRT displays emit a lot of radiation, is that what everyone thinks? We first tested it, and the front of the display screen was tightly pressed against 1.00uT, while the side of the display screen was tightly pressed against 0.55uT, which is quite impressive!
Looking at the center of the display screen, at a distance of 0.03 meters, there is still 0.55uT of radiation. Is this CRT display really radiating as much as we imagine? To further confirm, we started searching for its safe distance and found that at a distance of 0.2 meters, the radiation in front of the display screen attenuated to 0.18 uT. It seems that as long as the CRT display maintains a distance of 0.2 meters, it can be used with confidence. A friend from the audience asked if it had a high level of radiation behind it, just like a CRT TV, but after testing, it was found that it was not very high. Some people like to use anti radiation screensavers, but does it work? We also specifically tested it, and with a 10% reduction in screen saver radiation, it seems that the screen saver effect is not significant.
Radiation index of CRT display: ★★★☆☆☆
Nowadays, LCD displays are replacing traditional displays, and we have also tested them. The front of the display screen is 0.11uT, the power on moment is 0.12uT, the power off moment is 0.11uT, and the side of the display screen is 0.5m0.12uT. It seems that the LCD display is really reassuring.
Radiation index of liquid crystal display: ★☆☆☆☆
Let's take a look at the desktop computer's host again. The front is 0.17uT, but the central radiation of the host's operation panel is slightly stronger, with a distance of 0.03 meters and 0.26uT; 0.29uT on the side of the host, in the center of the left side of the chassis, at a distance of 0.03 meters, 0.23uT. The rear is 0.46uT, but we usually have a certain distance from the back of the host, so the impact is not significant. There is also 0.17uT in both startup and standby modes. Additionally, it should be noted that the radiation from the desktop computer's power cord when reconnected is 0.47uT, so it is important to maintain a distance when using the desktop computer again.
Radiation index of desktop computer host: ★★★☆☆☆
However, the following tests are not very optimistic: the subwoofer speaker, the center of the operation panel, a distance of 0.03 meters, 0.63 uT; On the center of the right side of the speaker, at a distance of 0.03 meters, 5.68uT; The radiation is not small, what is its safe distance? After careful testing, it was found that its radiation decreased to 0.17uT at a distance of 0.4 meters. So the subwoofer speaker has severe radiation, and it is necessary to maintain a distance of at least half a meter when using it.
Radiation index of subwoofer speaker: ★★★★☆
Finally, let's talk about laptops. The front of the display screen is 0.13uT, the front of the display screen is 0.3m0.10uT, the side of the display screen is 0.3m0.13uT, the top of the keyboard is 0.19uT, and the power adapter is 0.22uT. The test results show that the laptop keyboard has slightly stronger radiation, and the power adapter is the largest.
Radiation Index of Notebook: ★☆☆☆☆
Reminder: The radiation of the LCD screen is very small, and the CRT display is slightly larger, but both are within the safe range; The rear and side radiation of the host is relatively large, and it is strongly recommended that you do not open the chassis for convenient heat dissipation; The subwoofer speaker has severe radiation and should be kept at least half a meter away when in use; The radiation of the laptop is concentrated above the keyboard, and when using the laptop, it should be kept at a distance from the power adapter.
Radiation index of wireless mouse and keyboard: ★★★☆☆☆
Reminder: Normal keyboards, mice, wireless gateways, printers, digital cameras, and MP4 power supplies have minimal radiation, making them safe to use. But wireless keyboards and wireless mice radiate more radiation.
Refrigeration and heating appliances, electric blankets
Air conditioning is the longest used and most powerful in the bedroom. It is gratifying to note that its radiation is only 0.1uT at the moment of power on and off and during normal use, and the radiation value does not change much in various modes such as silence and sleep.
In winter, some families like to use small electric heaters, heaters, and other heating appliances, but their radiation is not small. Let's first take a look at infrared electric heaters. The results of testing at a distance of 1mm are: the radiation on the top is 1.8uT, and the radiation on the side is 5.4uT, which is very strong. We also tested at a distance of 1m, and the radiation is reduced to 0.14uT. The test result of the heater closely attached is 9.3uT, at a distance of half a meter, 0.34uT on the front and 0.25uT on the back. However, the most reassuring thing is the oil based electric heater. When used in high-end settings, the upper center is 0.19uT; At the center of the side, it is 0.18uT when close and 0.18uT when half a meter away.
Electric blanket, when used in high-end, is 0.71uT near the power supply, 1.15uT at the left corner on the opposite side of the power supply, 0.71uT at the right corner on the opposite side of the power supply, and 0.55uT at the center of the electric blanket; When in low gear, the left corner on the opposite side of the power supply is 0.70uT, and the right corner on the opposite side of the power supply is 0.49uT. It seems that the radiation of the electric blanket is quite significant.
Another major radiation source in the bedroom is an electric fan, with a low wind speed of 2.6uT and a high wind speed of 0.9uT; However, beyond 2m, the radiation decays to 0.11uT.
Humidifier, air purifier Humidifier radiation index: ★★★★★★ Air purifier radiation index: ★★★☆☆
We found in the testing that this type of fan humidifier has the highest radiation, and the test result close to it is 49uT, with 15uT for low-end use and 32uT for high-end use. However, it has been reduced to 0.52uT beyond 1m. The test result of ultrasonic spray humidifier close to it is 9uT, and 0.22uT 1 meter away. The test result of the air purifier closely adhering to it is 0.35uT, which is reduced to 0.12uT within a range of 0.5m.
Reminder: Humidifiers and air purifiers should not be too close to the human body.
Radiation index of electric hot pot microwave oven: ★★★★★★★★★
People who like to eat hot pot with an induction cooker should pay attention to it. Its radiation is not small. Take a look at the test results. The area above the induction cooker is 0.1m 2.80uT, and the area above the induction cooker is 0.3m 1.40uT. The area directly in front of the induction cooker is 8.70uT, and the area directly in front of the induction cooker is 0.3m 1.00uT. Looking at the test of the electric hot pot, it turns on a high-end 0.53uT and turns off a 0.13uT.
The test results show that the electromagnetic furnace has higher radiation, and the electric hotpot is better than the electromagnetic furnace.
Subsequently, we first conducted a test on the microwave oven that everyone was most concerned about, and found that the radiation at the crack of the microwave oven door was the highest. Therefore, we conducted a detailed test: at mid range firepower: 0.03 meters in front of the door crack 17.32 uW/cm2, 0.3 meters in front of the door crack 2.01 uW/cm2, 1 meter in front of the door crack 0.41 uW/cm2, and the center of the microwave oven door: 0.05 meters away from the door 30.14 uW/cm2
The test results showed that the maximum radiation was observed when the microwave oven was started (values ranging from 18 to around 22uW/cm2).
Refrigerator range hood ozone disinfection cabinet ozone electric rice cooker electric cake pan electric kettle juicer soybean milk machine
0.13uT outside the refrigerator door and 0.16uT inside the door (open); 0.38uT when the range hood is turned on 0.1 meters in front, and 0.11uT when it is turned off 0.1 meters in front; 0.14uT for opening the ozone disinfection cabinet and 0.55uT for opening the ozone machine cover; 0.16uT in front of the rice cooker; The electric cake bell is tightly attached to 3.60uT; The electric kettle is tightly attached to 1.20uT, 0.1 meters, and 0.30uT; Juicer 10.00uT; The soybean milk machine is close to 0.86uT, 0.1m and 0.30uT
Reminder: Refrigerators, ozone disinfection cabinets, and rice cookers can be used with low radiation and can be used with confidence; The radiation of electric cake bells and range hoods is slightly higher, which belongs to the warning range. Be careful not to stick them too close when using; The ozone machine, soybean milk machine and juice extractor have large radiation, so it is best not to let children use them.
Vacuum cleaner, electric iron, hair dryer, power wiring board
We tested this large vacuum cleaner before, and the radiation under normal use was 15uT, but it was not small; Nowadays, this small handheld vacuum cleaner is still popular. How much radiation does it have? We also conducted tests, and the distance at the handle is 0.03 meters, 6.64 uT; Left side center, 4.22uT; However, if you use it this way, its radiation can be attenuated to a safe range, at a distance of 0.2 meters and 0.15 uT.
Radiation index of large vacuum cleaner: ★★★★★★
Radiation index of small vacuum cleaner: ★★★★☆
The radiation of the electric iron is also quite high. We conducted a detailed test again and found that when the iron is heated, the radiation will increase. In the heating state, at the handle, it is 1.22uT; However, in a constant temperature state, the radiation decays to 0.12uT. So if you're ironing clothes, it's best to heat them up to the right temperature at once and continue heating them later. Don't iron clothes while heating.
Radiation index of electric iron: ★★★★☆
Hair dryers are also a large radiation source that we have discovered. In previous tests, low-end 4.20uT and high-end 10.00uT were used; Afterwards, detailed tests were conducted on different parts of the hair dryer during the hot air range, with a handle of 0.03 meters and 10.95uT; Air outlet, 7.16uT, it seems that hair dryers really need to be used less.
Radiation index of hair dryer: ★★★★★★
Another point to remind everyone is that if the power wiring board is connected to an unused electrical device at a distance of 0.03 meters, its radiation is only 0.11 uT, which is not significant; But when connected to high-power electrical equipment, at a distance of 0.03 meters, its radiation can reach 1.25 uT. This should catch your attention.
Radiation index of power wiring board (in use): ★★★★☆
Reminder: The radiation of vacuum cleaners and hair dryers is relatively high, and the radiation of electric irons is also not small. When using, it should be kept away from children, and the radiation of the power wiring board should also be your attention. Do not place it at the bedside.
Luminaires
Starting from the desk lamp, this is the desk lamp in the master bedroom, with a radiation value of 0.17uT. It is an energy-saving eye protection desk lamp used by children, and its radiation value is also 0.11uT. The study uses old-fashioned desk lamps, with a radiation value of 0.1uT.
The test results of the fluorescent lamp are: 0.12uT in the master bedroom, 0.18uT in the living room, and 0.11uT in the study. There is also a cartoon wall lamp that children like, which has a radiation value of 0.11uT.
Reminder: The radiation of various lighting fixtures is qualified and can be used with confidence.
Let's talk about the energy storage system again. The radiation value of the energy storage system is basically very small, so you can use it with confidence. Energy storage systems are now mostly designed for remote monitoring and management, with no one on duty. Therefore, maintenance personnel have limited access unless there is a malfunction.