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Ask Dr. Nancy Snyderman your questions about radiation

As the nuclear crisis in Japan unfolds, what questions do you have about radiation? What is radiation sickness, and should people in the U.S. take any precautions now? Ask your questions here for NBC Chief Medical Editor Dr. Nancy Snyderman.
/ Source: TODAY.com

Read Dr. Nancy's Q&A about radiation sickness here, and submit your own questions below.