In recent nuclear danger in Japan which is under control now, one of the most word we all heard was radiation from the nuclear plants. What I was more surprised was that radiation can not only come from Nuclear Plants alone but also from sleeping next to someone. Dont panic the amount of radiation is way to low in this case i.e. you might have to sleep 1000 of years to get affected from it.Surprisingly you get lot more compared to talking on cell phones and TV.
Below is a chart showing all the levels and sources. Click on the image to see a larger image.