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Bananas Are Radioactive

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You may have read about everyday objects setting off radiation alarms at border crossings between the US and Canada and Mexico. Newsweek has an article describing how medical radiation treatments (e.g., bone scans) may lead to traveling delays when they trigger radiation sensors. When the sensors are tripped, border officials conduct more intensive inspections to make sure you aren't carrying nuclear weapons. There are other ways to set off the alarms. Do you carry kitty litter in your car to help provide traction in icy weather or to absorb oil? It's slightly radioactive. Do you have tile or granite in your vehicle for a home improvement project? It has a relatively high radiation signature. Do you have a lot of bananas? They are also slightly radioactive. It's pretty easy to understand why tile, granite, and kitty litter are radioactive. They contain low levels of minerals that naturally decay. Bananas are radioactive for a similar reason. The fruit contains high levels...
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