A few years ago I was surprised to hear there were radiation concerns about granite countertops. According to the EPA it's not a serious threat. Any naturally

A few years ago I was surprised to hear there were radiation concerns about granite countertops. According to the EPA it's not a serious threat. Any naturally formed rock material has the potential of containing varying amounts of naturally occurring radiation. Natural radioactive elements like uranium, radium, and thorium can be present in a wide number of minerals that appear as crystals in granite from around the world. So, it is not unusual for materials such as granite to have some amount of radioactivity (emissions of alpha or beta particles or gamma rays). Depending on the composition of the molten rock from which they formed, some pieces of granite can exhibit more radioactivity than others. http://www.epa.gov/rpdweb00/tenorm/granite-countertops.html http://www.epa.gov/rpdweb00/tenorm/granite-countertops.html