It would have been helpful to get that number on that chart - just because it would help dispel bad information about the backscatter x-rays as well. The regular amount of radiation emitted by one of those machines is 0.1µSv (according to the chart - equivalent to eating a banana). The supposed mistake would have made the emissions 10 times higher (couldn't find a real µSv reading, just the 10x statement[1]) which would be 1µSv, or the same as using a CRT monitor for a year.
[1] http://www.wired.com/threatlevel/2011/03/tsa-radiation-test-...