The system settings and spectrum acquisitionwas controlled by the winTMCA32® software (with 1024 channels), that is also produced by FLIR®. Program code was developed in the winTMCA32 software to analyse spectra and obtain geographical locations, as well as export this data in GIS compatible format. The winTMCA32 code directly acquired the geographical position coordinated from the onboard GPS via a virtual communications port. The code also corrects for detector dead time and the corrected counts from the various energy windows are then combined with the positions data of each measured point. The code finally stored all hardware settings, in situ spectra and the results in files.