How much radiation is a human subjected to when TSA performs a full body scan using the newly deployed AIT?

Recently the Transportation Security Administration (TSA) has rolled out a new body scanning device (ie. Advanced Imaging Technology (AIT) scanners) to provide an added layer of penger security when traveling via air. According to the TSA there are now 317 in use at 65 airports with a total of 450 to be deployed when finished across the USA.