Originally Posted by FliesWay2Much

I suggest you read the Hopkins report. The contractor, Chertoff, Inc., would not allow Hopkins to test a production unit and the TSA let Chertoff get away with it. So, they had to test a unit put together from spare parts and prototype units.

Hopkins wanted to test for radiation intensity outside the unit, in order to establish some sort of "keep-out" zone for screening clerks, but, could not do so without using an operational unit. The report provides interim guidance for a "keep-out" zone, pending actual testing on the real thing:

4' at either side
6' to the rear
13' above

Statistically speaking, a whole lot of screening clerks are going to become very sick some day.