Full body scanner technology is suspect, to me. From the reading I’ve done over the years I have come across reports writing that it’s harmless. Others that say that all radiation exposure is cumulative, and thus one should avoid it as much as possible. And others reporting that this exposure rips apart your DNA and damages your immune system, among other dangers.
I found this report on this topic. It has references and comments at the end that may be of interest. It’s easy to find advertisements from earlier decades claiming such things as, “75% of doctors recommend Camels”(cigarettes). Just because they claim it is safe now doesn’t mean this will not be revealed to be dangerous later.