Echos of Therac-25. Not nearly as bad... no one's dead yet.
http://www.nytimes.com/2010/01/24/health/24radiation.html
Actually, if you look at the author's work, he's been covering radiation overdose all year.
http://topics.nytimes.com/top/reference/timestopics/people/b...
Ten years later, I've meant to finish the book. It's in a box somewhere.