Word: millimicrogram
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Plutonium is different. When it gets into the human body, it accumulates in the bones and spleen and stays there, gradually killing the tissue cells around it. A mere trace is poisonous. Water containing more than one millimicrogram of plutonium per liter (one part in one trillion) is dangerous. Isolating it does no good: plutonium loses only one-half of its activity in 25,000 years...
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