Don't buy that BS about the radiation being a small amount. The problem is that your skin absorbs most of it and that's where the cancers will start to develop.
Airport body scanners deliver radiation dose 20 times higher than first thought | Mail Online
Scientists Question Safety Of New Airport Scanners : NPR
The dose from Compton backscatter screening. [Radiat Prot Dosimetry. 2011] - PubMed result
There's tons and tons of literature all over the internet about this. I am all for airport security but I think Canberra should be petitioned to halt its implementation before its long term effects are understood.