Senior Moderator; Moderator, Eco-Conscious Travel, United and Flyertalk Cares
Join Date: Jun 1999
Location: Fulltime travel/mostly Europe
Programs: UA 1.7 MM;; Accor & Marriott Pt; Hyatt Globalist
Posts: 17,831
The Travel Safety and Security is filled with information on the various scanners and potential health risks. In general, you might want to look for information from RadioGirl, who has posted much information on the issue.
There are also lots of stories about opt outs in that forum. Many people on the bulletin board - me included - do not go through the scanners. Some agents seem to make you wait longer than necessary and treat it as a hassle, but so it goes. Anyway, lots on security checkpoints in that forum that you'll likely find of interest.