Radiation in nature comes in many forms; here, we're referring to electromagnetic radiation.
For appliances, the main impact on humans is magnetic radiation.
Electromagnetic radiation is divided into two levels.
The units for the industrial frequency band are μT, and the test covers industrial electromagnetic waves below 50 Hz frequency (such as household appliances and high-voltage lines).
If radiation above 0.4μT is considered strong radiation.
Radiation levels are between 0.3 and 0.4 μT, falling within the warning threshold.
Regarding the 0.3μT and especially below 0.1μT, it can be considered safe.
The unit for radio frequency electromagnetic waves is μW/cm² (e.g., microwave ovens, mobile phones, base stations for broadcasting and television).
Typically, the frequencies tested range from hundreds to thousands of hertz.
Above 10μW/cm² can be harmful to humans.
Television: Traditional Cathode Ray Tube (CRT) Televisions:
Within a half-meter radius, upon normal activation, it emits a radiation value of 0.12μT.
The radiation level during normal viewing is 0.30μT.
During the switch, the value was 0.27 μT.
The standby state is 0.11μT.
On the side, the radiation value is 0.28μT when viewed normally.
The positive 3-meter radiation has a significant degree of attenuation.
Shutting down, normal viewing, channel changing, and standby modes all register at 0.12μT.
The intensity behind it is relatively high:
Upon startup, the radiation level reached 4.8μT within half a meter.
And even through glass and wood, the radiation does not decrease.
Radiation levels were still measured at 0.9μT even through a wall of 10 centimeters thick.
Plasma Television
At a distance of half a meter, power-on, viewing, and channel changing all emit 0.11μT, while in standby mode, it is 0.12μT.
0.11 μT on the side
At a distance of 3 meters in front, the magnetic field strength is 0.12μT when the device is turned on, and 0.14μT during normal viewing.
Switching and Standby State: 0.11μT
Television: Rear-projection
During normal viewing, the magnetic field strength is 0.12μT on the front, 0.19μT on the sides, and 0.14μT on the back.
0.11μT at 0.5 meters in front; 0.1μT at 3 meters in front
TV: LCD Television
Regardless of the distance, whether it's within half a meter or three meters in front.
The test results for the power-on moment, normal viewing, channel changing, and standby status all show 0.1μT.
And the side is only 0.11μT.
CRT Monitor:
In front of the screen, 1.00μT is closely adhered.
The display side is tightly adhered to 0.55μT.
Display screen*, 0.03 meters away, radiation is 0.55μT.
At 0.2 meters, the radiation in front of the screen had attenuated to 0.18μT.
(- Our anti-radiation screen saver has also been tested, with a reduction in radiation of only 10%.)
Liquid Crystal Display
0.5 meters from the display screen, 0.11 μT
Instant startup with 0.12μT
Shut down at 0.11μT
Display side: 0.5 meters, 0.12μT
Laptop Computers:
0.1 meter from the display screen, 0.13 μT
0.3 meters from the display screen, 0.10μT
Screen side: 0.3 meters, 0.13μT
Above the keyboard: 0.19μT
Power Adapter 0.22μT
Standard Mouse 0.1μT
Standard Keyboard 0.11μT
Wireless Mouse - 0.53μT above the mouse
Wireless Keyboard - 0.96μT above the keyboard
Wireless Gateway; Above Gateway, 0.15μT
Printer available with 0.11μT.
Digital Camera Power Adapter 0.11μT
MP4 Power Adapter 0.16μT
Desktop Computer's Motherboard:
Preceding 0.17 μT
The mainframe operation panel exhibits slightly higher radiation, with a distance of 0.03 meters and a reading of 0.26μT.
The mainframe side is 0.29μT.
Chassis left side*: 0.03 meters away, 0.23μT. (Followed by 0.46μT)
Instantly upon powering on and in standby mode, the magnetic field strength is 0.17μT.
Power line radiation is 0.47μT when the power is connected.
Subwoofer Speaker
Control Panel*, 0.03 meters away, 0.63 μT;
Speaker right side, 0.03 meters away, 5.68μT
At a distance of 0.4 meters, its radiation reduces to 0.17μT.
Power Strip
When connected without power, at a distance of 0.03 meters, its radiation is only 0.11μT.
When connected to high-power electrical equipment, at a distance of 0.03 meters, its radiation reaches 1.25μT.
Power outlets are 0.13μT
DVD Player with Audio System, in close alignment with the test results,
DVD 1.2μT, OK Machine 1.2μT, Amplifier 1.24μT
The small speaker emits 1.5μT, and the large speaker 0.49μT. If both are turned on simultaneously, the radiation can be significant.
The electric fan emits radiation of 2.6μT at low wind speed and 0.9μT at high wind speed; however, beyond 2 meters, the radiation decreases to 0.11μT.
Hair Dryer
Low-grade 4.20μT, *10.00μT.
During high-heat mode, the handle area measures 0.03 meters and the magnetic flux density is 10.95μT; at the exhaust outlet, it is 7.16μT.
Treadmill:
In operation, the treadmill's panel measures 0.15μT, the front of the conveyor belt registers at 3.90μT, and the rear of the conveyor belt at 0.11μT.
Table lamp, its radiation value is 0.17μT.
Energy-saving and eye-care desk lamp, with a radiation value of 0.11μT; the old-style desk lamp used in the study room has a radiation of 0.1μT.
The test results for the fluorescent lights are as follows: Master bedroom: 0.12μT, Living room: 0.18μT, Study room: 0.11μT.
Popular cartoon wall lamp among children, with a radiation value of 0.11μT.
Microwave oven door seams emit radiation, so detailed testing was conducted.
At medium power output: 0.03 meters in front of the door gap, 17.32 μW/cm².
0.3 meters before the door gap, 2.01 μW/cm²
1 meter in front of the door gap: 0.41 μW/cm²
Microwave Oven Door*: 30.14 μW/cm² at 0.05 meters from the door
Test results indicate that microwave ovens emit radiation upon startup (approximately 18 to 22 μW/cm²).
Protective clothing:
The human body itself is a large conductor.
Wearing it only transfers the shielded radiation into the human body.
And currently, there is no clear standard for the material of protective suits.
Therefore, we advise you not to place undue faith in the protective suit's effectiveness.
Juicer 10.00μT
From: sohu.com "Educational Observation"
In July 1993, World Vision magazine also highlighted that electromagnetic waves can weaken human immunity and reduce the number of white blood cells that combat cancer cells. A child under 15 living in a room with a magnetic induction intensity of 0.3μT has a 4 times higher likelihood of developing leukemia compared to a child of the same age in general.
In January 1997, scientists at the Karolinska University in Stockholm, Sweden, conducted a survey of 430,000 residents who had long-term exposure to high-voltage transmission lines and published their research findings. The scientists clearly stated that there is a direct link between electromagnetic waves and cancer, particularly brain tumors and childhood leukemia. Lennart Frejberg, the head of the Mechanical Department at Lund University, said that among the employees working there, six cancer patients were found, four of whom were caused by electromagnetic radiation due to their daily exposure to an environment with a magnetic induction intensity as high as 40μT.
Directly below the 400kV high-voltage line, the magnetic induction reaches 13μT. At a distance of 30 meters, the magnetic induction is 8μT, and at 200 meters, it drops to 0.1μT.
The U.S. had already published in IEEE Spectrum's 10th issue in 1995 that the magnetic induction intensity of 60Hz should not exceed 0.2μT, otherwise it may pose harm to humans. Currently, Sweden has officially recognized that low-frequency magnetic fields with intensities above 0.2μT are harmful to human health.
