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Earlier this week, the Food and Drug Administration advised the public not to eat certain Great Value–brand raw frozen shrimp products for a rather unusual reason. Not because of contamination by bacteria like Salmonella , Listeria , or E. coli , which were responsible for more than a third of food recalls last year—but due to the shellfish containing Cesium-137, a radioactive isotope. Yes, radioactive.

U.S. authorities detected the substance in shipping containers coming from Indonesia at four ports of entry (Los Angeles, Houston, Miami, and Savannah). Further testing revealed a small amount of the Cesium-137, or Cs-137, actually in one sample of br

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