Sources: Walt Bogdanich, "Medical Group Urges New Rules on Radiation," The New York Times, February 4, 2010; "As Technology Surges, Radiation Safeguards Lag," New York Times. January 27, 2010; "Radiation Offers New Cures, and Ways to Do Harm," New York Times, January 24, 2010; and "Case Studies: When Medical Radiation Goes Awry," New York Times. January 21, 20 10.