If you bought Walmart frozen Great Value shrimp, check the lot numbers. The Indonesian supplier triggered an alert for Cesium-137, a radioactive isotope produced from nuclear reactions

The levels are quite low, 68 Bq/kg vs the FDA limit 1200 Bq/kg but any is bad

FDA Advises Public Not to Eat, Sell, or Serve Certain Imported Frozen

FDA Advises Public Not to Eat, Sell, or Serve Certain Imported Frozen Shrimp from an Indonesian Firm

U.S. Food and Drug Administration (www.fda.gov)