Complex?

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.

Which military based in Australia do you think helped by supplying this?

Australian civilian radiation services with backing of AGSO (Australian Geological Survey Organisation) are easily able to handle this all within Australia w/out reaching out to the Indians, Pakistani's, Iranians, Russians, South Africans, or other international nuclear agencies.