Simply put: The strongest radiation emanates from the back of the computer, followed by the sides, while the weakest radiation comes from the front—the part we face daily. This applies equally to both desktop and LCD monitors.
Radiation primarily causes discomfort to the eyes. In severe cases, it may lead to eye-related diseases. Therefore, you should pay more attention to eye care and protection methods.
Electromagnetic radiation is categorized into two levels. Power frequency radiation is measured in μT. Radiation exceeding 0.4 μT is considered moderately strong and poses potential health risks to humans, with prolonged exposure increasing the risk of leukemia. Radiation below 0.4 μT is relatively safe. Radiofrequency electromagnetic waves are measured in μW/cm².
Television
The traditional cathode ray tube (CRT) television was the first to undergo testing.We first conducted close-range testing: within half a meter directly in front, the radiation level at startup was 0.12 μT, during normal viewing it was 0.30 μT, while channel-changing produced 0.27 μT, and standby mode registered 0.11 μT. When viewed from the side during normal viewing, the radiation level was 0.28 μT,Overall, these readings approach the warning threshold. This article is from Jiujiu Common Knowledge Network www.99xcs.com编辑.
Since most people watch TV from a distance of about 3 meters, we also tested at 3 meters directly in front of the screen. We found significant radiation attenuation: powering on/off, normal viewing, channel switching, and standby all registered 0.12 μT. These results indicate that traditional CRT TVs pose no harm during normal viewing.However, surprisingly, radiation intensity was notably higher behind the TV. Within half a meter of the TV when powered on, radiation levels reached 4.8 μT. This radiation did not diminish even when measured through glass or wood panels, and even through a 10-centimeter-thick wall, radiation levels remained at 0.9 μT. If your TV is positioned directly behind your bedroom headboard, caution is advised. However, since people typically rest and watch TV at different times, this issue is generally not a major concern.This article is from Jiujiu Common Knowledge Network www.99xcs.com编辑. Now, for the plasma TV: at half a meter from the front, the radiation levels were 0.11 μT during power-on, viewing, and channel-changing, and 0.12 μT in standby mode. At the side, it was 0.11 μT.At 3 meters from the front: 0.12 μT during startup, 0.14 μT during normal viewing, 0.11 μT during channel changes and standby. Test results indicate plasma TVs emit slightly lower radiation than some traditional TVs.
For rear-projection TVs, during normal viewing: 0.12 μT directly in front of the unit, 0.19 μT at the side, 0.14 μT at the rear; 0.11 μT at 0.5 meters in front; 0.1 μT at 3 meters in front.
Among all TV types, LCD TVs offer the most reassuring radiation levels. Whether measured at half a meter or 3 meters from the front, readings remained consistently at 0.1 μT during startup, normal viewing, channel switching, and standby modes. Side measurements also showed minimal variation at 0.11 μT, indicating virtually no fluctuation in radiation intensity.
Test Results: Comparing the three TV types, it's clear that LCD and rear-projection TVs emit the least radiation, plasma TVs slightly more, while CRT TVs emit somewhat higher levels—though primarily from the rear. This suggests maintaining a safe viewing distance, especially for children.
DVD Players and Home Theater Systems
Home theater systems—combining DVD players with sound systems—have gained popularity in recent years. Test results show: DVD player: 1.2 μT,DVD players at 1.2 μT, amplifiers at 1.24 μT, small speakers at 1.5 μT, and large speakers at 0.49 μT. When all components are operating simultaneously, the cumulative radiation exposure can be significant.
Recommendation: Minimize home theater usage. For singing, it's preferable to visit a KTV establishment. This article is provided by Jiujiu Common Knowledge Network www.99xcs.com编辑.
CRT Monitor LCD Monitor Desktop Computer Small Speakers Laptop Computer
People have long believed CRT monitors emit high radiation. Is this really the case? We first tested it: 1.00 μT directly in front of the screen and 0.55 μT on the side—that's not insignificant!Now, looking at the center of the screen at a distance of 0.03 meters, the radiation still measures 0.55 μT. Could it be that CRT monitors really emit as much radiation as we imagine? To further verify this, we began searching for its safe distance. The results showed that at a distance of 0.2 meters, the radiation in front of the screen had already decayed to 0.18 μT. It seems that as long as you maintain a distance of 0.2 meters from a CRT monitor, you can use it with peace of mind.Some viewers asked if it's similar to CRT TVs with higher rear radiation. Testing showed it's not significant. Others use anti-radiation screensavers—do they work? We specifically tested this too: adding a screensaver only reduced radiation by 10%. Seems screensavers aren't very effective.