The FDA has issued another recall notice, expanding the list of products that could be contaminated with Cs-137. This recall is being carried out by Aqua Star (USA) Corp. of Seattle. As with previous recalls, these shrimp were processed by an Indonesian company whose containers tested positive for Cs-137. Cs-137 is a radioactive isotope that is widely found in trace amounts throughout the environment, due to widespread testing of nuclear weapons in the 1950s and 1960s.