Some blurb from Rockwell Collins on their Multiscan Radar (150W by the way)
“The American National Standards Institute has specified a maximum level of 10mw/cm^2 for personal exposure of 6 minutes or longer to radar antenna electromagnetic radiation. The exposure time is limited to the amount of time within the antenna pattern during each sweep.......Microwave ovens represent a more public safety concern and their leakage standard has been set at 4mw/cm^2. The WXR-2100 power density is half or less than that of the microwave oven standard.”
Which backs up what Pineteam is saying. Now I’m not going to lie down on a radome while the radar is switched on any time soon, but I will be pretty relaxed about whether I’m going to get fried if the radar happened to get left on.
As a general rule, a while ago I read 50ft avoidance should cover pretty much most of the radars out there today.