> There's no safe dose of radiation, there's only statistics.

You need potassium to live; it's radioactive. UVB rays provide vitamin D, but too much can give you skin cancer. Of course it's all a stats game, but (ionizing) radiation plays an important part in our lives and survival.

Of course it's all a stats game, but the stats can play out how much you should worry about it. Living in Denver can expose you to up to twice as much cosmic radiation as somebody living at sea level, yet there are no statistical differences in cancer rates. You don't need to worry about your granite countertops, either (though it's fun to joke about the radioactive stone in the US capital building making congress "toxic").