How dangerous are airport baggage screening x ray machines?

[Bill Angel]

There was a somewhat humorous incident reported recently in the newspapers.

See Drunk tourist falls asleep on airport baggage belt and passes through powerful X-ray machine

The second incident reported in the article doesn't sound so humorous, in that a young infant was deliberately sent through an airport's baggage screening x ray machine by its not too bright parents.

One does wonder whether either of these people, the child in particular, will suffer lasting effects from the exposure to the radiation.