It didn’t say that it would make anything radioactive, it said there was a radiation hazard. Radar is in fact radiation, it’s just non-ionizing which means that unless you’re dealing with massive power levels it’s generally safe to be around. If they’re warning of an extreme radiation hazard it’s either not radar, or they’re pumping a ridiculous amount of power into it.
That does appear to be the problem. The US might not officially be a gerontocracy, but it sure does a damn good job looking like it these days.