yes, lunch etc gets put through ,what i believe is an x-ray machine whilst personnel walk through arch detector. Personally, i'm not aware of any great risk,the doses of radiation received are much less than getting on an aircraft and flying high level and the fat/salt etc in my lunch will probably get me before anything else! There is a question ,of course, should anyone be forced to receive any axtra exposure to radiation? the main point is why trust someone 'a little bit';either scan/search properly or don't bother.