Recovery and reanalysis of archived airborne gamma spectrometry data from the 1991 Dounreay survey

Archived Airborne Gamma Spectrometry (AGS) data from the 1991 NIREX characterisations of Caithness have been recovered. The separate gamma spectrometry and positional data streams for approximately 120,000 measurements have been combined into a single data stream using the European Radiometrics and Spectrometry (ERS) data format. An analysis using working calibration coefficients and spectral stripping procedure has verified that the original survey recorded high quality data. The converted data stream is in a format more accessible to future research use, including evaluation of environmental change in the Caithness region. - Research highlights: ►1991 Airborne Gamma Spectrometry survey of Caithness. ► Recovery and reanalysis of archived data. ► Measurements of 134/137Cs fallout and redistribution.