In a typical volume of soil that measures 1 mi 2 and 1 ft deep, there are

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In a typical volume of soil that measures 1 mi2 and 1 ft deep, there are roughly 2 g of radium, predominantly 236Ra. But 236Ra has a half-life of just 1600 yr, while the Earth is billions of years old. Where did this radium come from?

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