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The TSA systems (at least the backscatter X-ray) do use a focussed moving beam to build up an image. They rely on the continual movement of the beam to limit the dose. There are a …

It can be done if the people have good equipement and REALLY know what they are doing. The trouble is that the venue hire the cheapest people to fit the system and have no clue how…

It all balances out. The industrial revolution removed the need for lots of manual laborers and replaced unskilled jobs with machines. But then TV came along and created even more …