Here’s what you’ll learn when you read this story:The U.S. Food and Drug Administration (FDA) issued a warning that Great Value brand shrimp sold at Walmart in 12 U.S. states contained unsafe levels of the radioactive isotope cesium-137. The agency hasn’t recorded unsafe radiation levels in products sold at Walmart, but did detect the isotope’s presence at four U.S. ports. In fact, this is such a well-known source of agriculture radiation that scientists have informally labeled safe radiation levels as “ banana equivalent dose ” (or BED) for decades. Bahari Makmur Sejati, or BMS Foods—tested positive for unsafe levels of the radioactive isotope cesium-137. The FDA is advising customers to throw away any Great Value brand frozen raw shrimp with the expiration date of 3/15/2027.