Best Anti-Radiation iPhone 4s/iPhone 3GS Case?

My occupation requires a lot of talking on the mobile phone. I just want to know what brand of case is best to prevent radiation. It doesn't matter what the price is, as long as it works. I will need 2 cases, one for the 4s and the other for the 3gs. I've found two cases which are Pong and Snugg. If you could tell me which of the 2 is best or link me to a brand which is even better.

If there was a case that blocked the radiation coming from your iPhone (I'm sure you don't even know what kind of radiation it is, or even what radiation is) it would also block the radiation being received by it, and its antenna would work even more poorly than it already does, that is, not at all. In simpler terms (for your simple mind), if it blocked radiation, you would receive no signal whatsoever, and the phone would not be able to send out any signals. But if you really must have something that blocks radiation from phones, then just wrap it up in foil or a piece of metal window screen. You have to wrap the whole thing, though or the radiation will "escape" through the screen. You won't be able to see it or use it, but that's ok, because you'll be "safe" from the radiation, and it will let everyone know just how much of a dumbass you are for believing that cell phones are dangerous, thus killing two birds with one stone!