Everyone should opt out of the TSA scanners. They're just blasting you with ionizing radiation. You already get enough going on a plane, you don't need more. I don't know if you can opt out in other countries, but you 100% are allowed to in the US, they'll just make you wait until someone can come and molest you.
I was adjacent to EMI testing for one of those things, that was a big concern of the FCC for a while because they originally radio jammed all wifi in the area (before they turned it into a giant box).
I would say don't worry about it, it's all just microwaves. If you don't feel too hot you'll be ok.
I don't think its meant to detonate anything either. Although I wouldn't be surprised if a CIA nigger threw one of those EW guys in there after they faraday caged the thing.
It takes advantage of the same microwave heating principle of water resonating and strongly absorbing at 2.4 GHz. IE they use it to see through your clothes because there's no water in them.
If you want to play a funny prank on them you can soak your clothes in water and see what happens. (You're just really sweaty)
Edit:
This is what they looked like at first
Very open and comfortable, looks just like an X Ray which people are familiar with.
EMI nightmare. Scanner is a flat plate that the beam can scatter off of in all directions without obstruction.

Here is what they look like now.
Cage like and scary, very intimidating.
Thick body with grounded plating in almost all directions. Scanner is in a deep beam dump in the back. Hardly any scattering.
Much better for EMI.