Some packages of Great Value frozen shrimp sold at Walmart are at risk for potential for Cesium-137 contamination, the FDA says.

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.

Great Value brand frozen shrimp sold at Walmart stores in Ohio could be contaminated with Cesium-137, warns the FDA.