"trust me bro" science at its finest.
Do we get to see the service interval on these machines to ensure that they are operating fine and have never had an issue?
https://pmc.ncbi.nlm.nih.gov/articles/PMC3936792/
"Based on what is known about the scanners, passengers should not fear going through the scans for health reasons, as the risks are truly trivial. ... it is premature to put a whole population through this with out more due diligence and independent testing"
Even the papers on this stuff can't come to any sort of agreement.
Easy enough to opt-out and just avoid the question entirely. I'm not bothered at all by the pat down.