[defrost]

Takes a while to do an entire continent this way, luckily when you start in the 1970s it's all over by now.

* https://www.ga.gov.au/bigobj/GA13928.pdf

* https://www.ga.gov.au/bigobj/GA18007.pdf

Visualising full 256 channel multispectral data can be tricky, the approach taken above was to take the raw data and process it to create a false colour RGB image representing the strength and interaction between natural background potassium, thorium, and uranium.

[DoctorOetker]

Thank you for this reference! I had been looking for such data for a long time.

[defrost]

It's been kicking about in geoscience collections, mining company archives, etc. for a while.

Russians, South Africans, USAians, et al all run crews - we (Australia) have done Australia, Mali, other African regions, all of Fiji (many islands), India in May 1998 (the Pokhran-II nuclear test sites as they happened), and elsewhere.

The data is one thing, processing raw spectrometer data is a whole other thing - calibrations, corrections, dead time, etc.

See: Grasty / Minty GUIDE TO THE TECHNICAL SPECIFICATIONS FOR AIRBORNE GAMMA−RAY SURVEYS https://www.ga.gov.au/bigobj/GA7667.pdf

[DoctorOetker]

Do you know of similar maps for Europe?

[defrost]

This is a different kind of radiometric data that is available:

  The EUropean Radiological Data Exchange Platform (EURDEP) consists of data exchange mechanism and presentation website for radiological monitoring data which is collected and shared by 39 participating countries in almost REAL TIME.

* https://remon.jrc.ec.europa.eu/About/Rad-Data-Exchange

Certainly useful for a mapping European normal background, the details under the hood could be a pain (types and formats of data, etc), it's historic and ongoing chronological data for distributed fixed points.

Their interactive public play map is normalised(?) raw total counts, _not_ a spectrum of gamma events bucketed by energy - ideally they are also recording and sharing full spectrum data at some stations in their network .. and making that publically available.

Of possile interest:

* https://www.abc.net.au/news/2022-08-10/hedley-marston-marali...

* https://www.wakefieldpress.com.au/product/fallout/

[defrost]

Know of .. yes.

Off hand, I'm not familiar with any public facing portals for downloading raw data.

Bear in mind, these are "snapshot" static, historic, broad area spectrum maps - they're not live, they won't show new leaks, changes, etc.

They are, however, "training data" for forming a kernel of a NASVD - Noise Adjusted Singular Value Decomposition - a bundle of all the major features of typical regular environmental radiation for some locale.

If you fly about or have an instrument taking live readings and subtracting a normalised background kernel .. you get the faint trace "weird arse stuff" lighting up instead of being buried.

Finland's the home of the NASVD author, the country used to run "find a barrel of waste" in a forrest compitions back in the day, they're adjacent to some radiometrically filthy submarine docks and pens just over a border.

The game goes thus - fly at about 70m/sec about 80m above the deck in some kind of frame carrying 30 to 40 litres of doped crystal packs .. and pick out a signature in near real time from one second spectrum windows.

They have data, I don't know about portals.

https://www.helsinkitimes.fi/finland/finland-news/domestic/2...

Can confirm, though, Cresco STOL's make a good platform: https://www.youtube.com/watch?v=1_MO5Wfomks