Sounds like the sort of complex setup developed prior for other more exotic use cases...
Seems straightforward enough in the geophysical instrumentation domain.
Exotic? Radiometric mapping has been around for 50+ years - Australia has mapped the entire country (size of mainland contiguous USofA) from aircraft with ~200m line spacing in that time (along with surveying other countries, Mali, Fiji, India|Pakistan border, elsewhere), Russia, South Africa, Finland, USofA also have radiometric survey teams.
It's handy for finding drums of radioactive waste in a Finnish forrest near the Russia border, for example, which was an actual contest | exercise some years ago.