Without any evident sources, radiation has been reaching lethal levels around this one specific cabin, particularly when chopping some of the oak trees north of the building, but also at random when moving in the vacinity of the cabin.
Chop down trees north of the cabin, suffer massive radiation poisoning. Alternatively, move around the cabin without any specific direction, notice "irradiation" rise at random intervals.
"Irradiation" status should reach damaging levels.
Before logging:

After logging:

Map of the surroundings:

Stuff possibly related to the issue that i own: Undamaged atomic reading light, undamaged microreactor, non-radioactive spiral stone.
Some areas are randomly radiated. Are you able to spawn in a geiger counter/use debug to test?
So I spawned geiger counter and played around with it.
Your house, your front porch area especially(and your front yard where all plants are non existant) are incredibly irradiated.
I suggest you to find some lead vests.
Most helpful comment
So I spawned geiger counter and played around with it.
Your house, your front porch area especially(and your front yard where all plants are non existant) are incredibly irradiated.
I suggest you to find some lead vests.