Walmart announced a recall on Tuesday for Great Value raw frozen shrimp products after the U.S. Food and Drug Administration detected a radioactive chemical that may pose a safety concern.

The FDA detected Cesium-137, a radioactive isotope of Cesium, on a single shipment of frozen shrimp imported from Indonesian company PT. Bahari Makmur Sejati.

Cs-137 is a byproduct of nuclear reactions, including nuclear bombs, testing, reactor operations and accidents. It’s widespread around the world, with trace amounts found in the environment, including soil, food and air.

Walmart recalled products that tested positive for the chemical in 13 states: Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Missouri, Mississippi, Ohio, Oklahoma, Pennsylvania, Texas and West Virginia.

The level det

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