[defrost]

If you scroll to Australia you can see the data coverage is largely occassional driving about on a few roads.

It's interesting they don't include, as a baseline reference, the near complete Australian coverage by 256 channel radiometric data (available for free download): https://www.ga.gov.au/scientific-topics/disciplines/geophysi...

Such datasets are relatively common across the globe and none that I'm aware of appear to be included.

Their devices appear to be all total count gieger types which don't seperate out energy bands or have much accuracy - ie. "good enough" for coarse results, not that great for identifying radon Vs ??? as a source.