International officials say contaminated metal at an industrial site in Indonesia could be the source of radioactive material behind recalls of imported shrimp. BMS Foods, the exporter of millions of pounds of shrimp, has recalled more than 300 shipping containers that were already on their way to the U.S. Federal health officials issued a safety alert last month after they found Cesium-137 contamination in shipping containers and a sample of frozen shrimp. The health risk appears to be low, but could come from ongoing-low level to the radioactive isotope.