Pills do help, but radiation in that zone isn’t equal. There are 3 tiers of radiation in that zone. Using Chernobyl as an example, tier 1 is taking a tour of the area, tier 2 is going inside the reactor building, and tier 3 is taking a selfie next to the “elephants foot” (if you aren’t familiar with that, it is a giant blob of “corium”, a substance only created by reactor meltdowns, probably the most lethally radioactive material known to man)
The whole zone is mostly tier 1. Getting close to the crystals you need to make duraluminum is tier2. Standing in the green shit near the crystals is tier 3. Don’t stand in the green shit unless you want to max out your radiation meter extremely fast. Buggy mining is a bit safer since you can’t get tier 3 radiation while inside and tier 2 can be minimized since the buggy mining laser has a nice range to it. With a buggy you can probably last about 20 minutes in the area, on foot and using an orni maybe 10.
If you do max out radiation, you’ve got maybe a minute to gtfo before you drop dead. If you can exit the radiation zone, your radiation levels will drop (even if you hit the full radiation level) and you can go back in