PythonMagus has asked me for EMF readings for television and computers. I am happy to oblige. The nasty surprise comes with laptop computers.
Televisions
I detected no danger with my television. I have a Samsung 50 inch LCD flatscreen.
[1] Right next to the screen there was an electro magnetic reading of 10-15 milligauss, however [2] this dissipated to less tham 3 milligauss a couple of feet away. The readings were the same whether the TV was showing moving images or a still photograph with lots of black as in the above image. There was a low microwave reading of .03 mW/cm2 but only within 3 centimetres of the screen.
With the TV sitting in the corner of the room, and at least 7 feet away from the nearest watching position, there does not appear to be anything to worry about.
Laptop Computers
We are a household with one desktop, and four laptop computers. All of the girls have an Apple laptop and I used a three month old Macbook Pro 13 inch for my test.
[3] Right next to the laptop screen I got a reading of 10-15 milligauss. [4] Moving back to the keyboard this reading went down to 4-5 milligauss which is just over my safe level of 3 milligauss. [5] Moving further back to the fromt of the laptop the reading was down to 1 milligauss.
The above readings may be a bit higher than I would like but not cause for huge concern as long as you don't stick your face right near the screen. But there is a less obvious and nasty problem with the laptop.
[6] Under the laptop, at the area where the computer actually makes contact with your body, was a high reading of 100 milligauss. This is definitely not good, especially when the 'lap' is the part of the body near the testicles and ovaries.
The lesson is don't use a laptop on your lap. When you put the laptop on a table and sit under the table, or use a portable laptop table / tray, this high reading is mostly blocked out. The table is better because there is more space between the computer and the lap. The laptop readings were the same whether the power cord was used or the laptop operated on battery. I did not get any microwave readings with the laptop.
Desktop Computers
My desktop computer setup did not give me grounds for concern.
[7] The desktop computer itself only gave a reading of 3 milligauss immediately outside the front of the case. [8] The computer screen, which is a Dell 22 inch LCD flatscreen, gave a reading of 10 milligauss right against the screen, but this went down to 3 milligauss 1 foot away. [9] The keyboard gave a reading of 2.5 milligauss. [10] The biggest reading came from the powerboard, which was over 100 milligauss right next to the outlets but down to 1 milligauss less than 1 foot away. As long as the powerboard is a couple of feet away from the body this is OK. I did not get any microwave readings with the computer equipment.
The last computer equipment I tested was the wireless router. Given that this equipment is designed to emit wireless internet to the house I was expecting a high reading. [11] Right next to the router the reading was 100 milligauss. [12] However, moving away from the router the reading was down to 2.5 milligauss 1 foot away. I did not get any microwave readings with the wireless router.
As long as the wireless router is keep at least a couple of feet away from the body it seems to be OK.
The children (and myself) are pleased that the television and the computers are not going to meet the same fate as the microwave. But (notwithstanding the name) the laptops should not be used directly on the lap.
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