As the secretary of the U.S. Department of Homeland Security, you are confronted with determining the seriousness of threats from several foreign countries. The dirty bomb or radiological dispersal device (RDD) is a significant concern that you must consider when mitigating terrorist attacks against targets within the United States and with its interests abroad.

Consider the fact that nuclear waste is readily available in countries that already hate the United States. What do you believe needs to be done to ensure the U.S. infrastructure is protected against nuclear and radiological threats?