Another interesting pattern I saw while browsing around was increased level next to every fancy cast iron light fixture along a specific bridge. The bridge was made mid 20th century so I don't think they are old enough to have used thorium gas light mantles.
I think if this is only what they allowed it would be a useful since it would measure real world exposure.
Not very useful or interesting in its current form, unfortunately.
If you don't believe any of this naturally occurring phenomenon for some reason, there are several YouTube channels that check out these places, and try to find their own high activity areas/objects. There also subreddits dedicated to it,'and even a map where you can find places! ;)
Many devices, uncalibrated and drifting, poor time normalisation to address counts accumulating when lingering, ... ffs they probably don't even adjust for cosmic or radon ...
( TBF the last two are pretty picky objections unless you're going hardcore geophysical professional )
When capturing open-air terrestrial tracks they are more or less uranium and thorium detectors.
Might be worth pointing out the principle reason preventing radon removal from a click counter, no matter how sensitive, is the lack of a channeled spectrum bucketing counts by energy level, and the main reason cosmic cannot be removed is the lack of channeled stacked height descent readings allowing a ground level current cosmic estimate.
> When capturing open-air terrestrial tracks they are more or less uranium and thorium detectors.
and Potassium also- just all bundled together as a total count with no discernment.
Still, perhaps one day in the future, just as modern GPS carry a coarse ground / ellipsoid separation model in order to return 0 elevation at the seashore, perhaps rad counters will carry a coarse global radiation background model to focus on counts over and above the expected.
( again, unlikely due to lack of real sensitivity and channel bucketing )