Except for maybe the lenses in your eyes, even moderately high power at those frequencies is not that dangerous because it doesn't penetrate much past the skin. You would feel uncomfortable heat or a sting on the skin and react to it before any damage is done. And the damage is heating, no magic disease or any effects like ionizing radiation you would have like from snuggling up to some Plutonium.
There are RF weapons to keep crowds at bay consisting of about a 5ft dish and 100kW of power at 95GHz that is focused into a very narrow beam due to the high antenna gain at that frequency. They demonstrate these now and then with volunteers, who feel the heat up to 100m away and run from it. There are no lingering effects and not even with the eyes.
When I worked at Hughes Aircraft (now Raytheon) in the 80s there was a group in my building that built and tested Gyrotron tubes, probably what is the heart of the ADS system. Even back then they were generating mind boggling power levels at mm wave frequencies and they had to test late at night for a couple of reasons. One was so they could get enough power routed to the building to run the tests and the other was from X-rays generated somewhere in the system. We would get announcements to remove any unexposed photographic film from the building on the nights they were testing.
Not safe at all......... 24-39Ghz is not good to be near at high strength!!
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