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Andy - Televisions really do give off radiation. But having said that, itís only a little bit of radiation and itís not that dangerous. What happens is that anything with a cathode ray tube, a tube where you shoot high-energy electrons at some sort of screen, when those electrons hit the screen, they give off very low energy x-ray radiation. This is the same way that x-rays are produced in regular x-ray tubes. So, if you're sitting close to a cathode ray tube, whether a computer monitor, a television screen, a radar set or anything else with that type of technology, you're going to be getting low doses of x-ray radiation.
[img float=left]/forum/copies/RTEmagicC_800px-1950__s_television_01.jpg.jpg[/img]Now having said that, Iíve got to emphasize, they're low doses of radiation. Itís not enough to be dangerous and in fact, if you watch your television for several hours a day all year, you're getting less radiation than you would from a single medical x-ray and less radiation than you get from the radioactivity thatís just naturally within your body. So, itís something that we can measure, but itís not something thatís harmful.
LCD and plasma screens don't give off any radiation at all. They don't use high-energy electrons. Itís a different type of technology. I could not say that they're safer because I don't consider the radiation from cathode ray tubes to be a risk, but I can say that they give off less radiation. As far as sitting too close to the television goes, the further back you are, the lower the radiation dose will be. But having said that, I don't consider the radiation dose even at a distance of just one metre to be dangerous.
"TV's now have LCD screens ... and emit no radiation. "Dark in here, isn't it.
Quote from: Bored chemist on 08/10/2009 18:41:29"TV's now have LCD screens ... and emit no radiation. "Dark in here, isn't it.I don't agree. Every TV in my house is still CRT-based. There will be a long legacy of the old TV days before these old units are all replaced.Chris
I don't agree. Every TV in my house is still CRT-based. There will be a long legacy of the old TV days before these old units are all replaced.Chris
I always thought that CRTs emitted x-rays (albeit at low intensity) and this was the reason not to sit too close, so as to reduce the dose. But then again, unless they are coming off at very wide angles, the distance from the TV wouldn't make an enormous different to your dose would it, air not posing much of a barrier to an x-ray...