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a friend of mine thinks that by buying a product called rayguard he can effectively shield against electrosmog.

On the website, there are multiple evidences that this might work. However the product seems to be just created of one plastic chasis with two spools inside. The functionality of the product is described as following:

With the RayGuards, the solution therefore is not based upon electronics but on physics. In a radius depending on the model of device used, all frequencies are absorbed.

This spectrum of frequencies is being put through a dividing and analysing system. There the compen- sation of the harmful waveparts is made.

To explain it better, we will use the example of a camera. Compare the effect of the RayGuard to the polarising filter. Disturbing effects of reflection are being cleared by the filter and the foto looks clear and colourful again.

I do not claim that I am a physicist , however after some research my personal opinion on this product is that it is not so simple to shield against radiation. My questions to you are:

  • Is it possible with the rayguard to shield effectively against radiation? If it is a scam? Why "not"
  • From a physical standpoint, how to shield properly against radiation? What device would be needed to shield effectively against for example mobile phone radiation
  • Is the everyday radiation from a physical standpoint "unhealthy"?

I really appreciate for your reply!

PS.: I know that this question is not the typical physics question which is asked here, however it would be great if you could give me some hard facts/theories to prevent my friend from wasting a lot of money!

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    $\begingroup$ Wouldn't it be cheaper to make a hat out of tinfoil and run a wire down to conducting booties? en.wikipedia.org/wiki/Tin_foil_hat $\endgroup$ – DWin Jan 4 '14 at 20:15
  • $\begingroup$ just a smaillish thing, it is physicist not physician $\endgroup$ – user36538 Jan 4 '14 at 20:42
  • $\begingroup$ @Amaterasu I corrected it! $\endgroup$ – user2051347 Jan 4 '14 at 20:45
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    $\begingroup$ It is a scam. Magnetic fields could protect you against charged particles (but fro non-trivial energies you need very significant field strengths which bring their own problems), but are of no help against gammas or neutrons. $\endgroup$ – dmckee Jan 4 '14 at 22:03
  • $\begingroup$ There are dozens of companies selling things like this. They're pretty much all scams. Their advertisement slogan "think of your children and your family" next to the ordering page is a huge red flag. $\endgroup$ – DumpsterDoofus Jan 5 '14 at 1:34
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Whether or not shielding against radiation is possible depends on the type of radiation. As an example the perforated metal shield in the front of a microwave oven is pretty effective. This type of radiation is called electromagnetic radiation . At lower frequencies it becomes radio waves, at higher frequencies light. At still higher frequencies we encounter X-rays, and at even higher frequencies, $\gamma$-radiation. X-rays and $\gamma$-radiation are dangerous, for X=rays lead is a useful shielding material. There also exists $\beta$-radiation (electrons) and $\alpha$-radiation (atomic nuclei).

The "Rayguard" you mention is likely not to work. Even if there is electronics involved it must be able to detect all frequencies of interest. This is pretty hard if not impossible to do so in the X-ray regime. In my opinion this rayguard is on the same level as the boxes that protected against "earth rays". There the scam was even more severe, earth rays are not supposed to exist.

About radiation from mobile phones being harmful opinions differ. Their radiation can be rather persistent. I have seen a demonstration with one such phone placed in a metal box as used for biscuits. When connecting to it from a second phone outside the box it still responded. Of course the radiation level inside the box is very low but still it was large enough to let the phone ring.

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  • $\begingroup$ Note that mobile phones detect the signal strength of the tower and adjust their transmit power accordingly. The tower does the same thing. So a limited amount of shielding is equivalent to "I am far away, shout more", and the phone adjusts. That does not prove that the signal did not get attenuated. $\endgroup$ – Floris Aug 3 '14 at 21:18

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