Tin foil can be used. Make sure the tin foil is earthed.
1. It is the tube's energy that is affecting everything else. Spacing is the key. Tin foil will possibly reduce the interference, but only if grounded properly; but it will also reduce the effectiveness of the program, so don't want to do that.
2. Which is more important - your health, or your entertainment and connectivity? Personally, I don't watch TV any longer, or listen to the radio. I leave my cell phone in another room, turned off. I can always get back to missed calls, but I might not be able to get back to missed frequencies.
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