being a frequent flyer perhaps you should consider getting earlier and opting out no matter how annoying it may be while you can, thing is, there is not enough data to know how much harm can do to people due to frequent usage, imagine the people working there...

a little reseaech

Airport Body Scanner Radiation Comparison

Modern airport body scanners use different technologies compared to metal detectors, and they emit different types of radiation. Here's a comparison:

* **Airport Body Scanners**:

- **Millimeter Wave Scanners**: These scanners use non-ionizing radiation, specifically in the extremely high frequency (EHF) radio band. They do not generate ionizing radiation and have no proven adverse health effects, though long-term studies are still needed to confirm safety.

- **Backscatter X-ray Scanners**: These scanners use low-dose ionizing radiation, typically delivering a dosage of between 0.05 and 0.1 μSv per scan. The radiation levels are very low, but there has been debate about their safety, leading to their ban in some countries.

* **Metal Detectors**:

- Metal detectors do not emit any radiation. They operate by generating a low-intensity magnetic field that passes from one side of the detector to the other. They are used to detect metals and can be sensitive to orthopedic implants and other metallic objects.

In summary, while metal detectors do not emit any radiation, airport body scanners can emit either non-ionizing or low-dose ionizing radiation, depending on the technology used.