EM Radiation with a frequency of 500MHz to 5Ghz has wavelengths in the tens of centimeters. It is completely harmless and utterly unusable for „viewing naked bodies“.

People have studied EM radiation for a very long time, and we know what‘s dangerous. Xray is dangerous, UV at high intensity is also dangerous, radio frequncy/micro wave is harmless (unless you go to really high intensities, but then you’d fry all electronics nearby)

Maybe check a physics textbook before you get all worked up.

Edit: Also, this technology is completely different and has absolutely nothing in common with millimeter wave scanners.