The x-ray will knocks out the electrons and destabilize the molecules to a point that few seconds of exposure will turn your Macbook into a Windows laptop. Yes, a solid Windows laptop. Last time a little Korean guy at the border checkpoint laughed about my advise and go on dumping his shiny new Mac into that x-ray slaughterhouse. Do you know what he got from the other end? Volia! It became a Benq netbook running Windows XP. Worse still, all the torrent files in his harddrive were turned into granny and gay porn.