The scary part is that this happened with medical-grade equipment, in medical facilities, with trained medical techs.

What standards, if any, do the current backscatter machines comply with? What training, if any, do the TSA techs receive on radiation? What training, if any, do the "repair techs" from the manufacturer have? How often, if ever, are these machines calibrated? Which independent experts are used to verify such machines are operating properly and in compliance? Exactly which frequencies are used and what is the duration and power of exposure? These are all questions which should be answered immediately and openly.

I'll opt-out every time. If they make these machines mandatory, I'll just opt-out of commercial aviation. Gen Av. is far more pleasant. More expensive, but I'll gladly pay whatever it takes to avoid the additional health risk.