The use of the full-body scanners at Schiphol is optional. The agents there are not very well-trained about this fact but people do normally succeed in opting out. For example, I succeeded after OHM earlier this month, though I was given more push-back than when opting out in the U.S.

Here is a Dutch government site about the scanners confirming that travelers are allowed to opt out:

http://english.nctv.nl/themes_en/themes-a-z/Security_and_civ...