Radioactive Water

Worried about airport scanners? What about every day drinking water?

It turns out that pure drinking water contains trace amounts of radium and other radioactive elements.

Drinking three glasses of water a day for a year might give you a cumulative exposure of about 0.045 millirems, that's at least five times more than the dose from an airport scanner.

But keep in mind, it's still way beneath the 10,000 millirem line where there is danger.

Credit: istockphoto