*dont put it on your pillow next to you when you sleep*.
Im not entirely convinced that if you sat with an electronic device on your lap for 5 hrs aday, you would live shorter than a person who did not. People live long past their life expectancy these days anyway, don't worry too much about it.
Since the transmitters are probably similar to that of a cellphone...+ u don't put the kindle on your face to talk to it>>>
mobile radiation.factsheet