Aircor

One of the recently developed optional components of the GAMMAN software is a module that allows for correction of airborne gammaray data for elevation, radon and cosmics. The module contains a large database of K, U, Th and Radon calibration spectra for each elevation between 0 and 160m. For each elevation, the relevant set of spectra is chosen and used to derive the actual nuclide ground concentration. 

The innovative part of the software is in the algorithm to derive the radon content in the airborne spectra. The origin of the ‘radon signal’, radiation wise, is for over 90% equal to the U238 signal. However, the difference in geometry of the Rn source (in the air surrounding the plane) and the 238U (in the soil beneath the plane) yields spectral shapes that are differing enough to allow for clear separation of the Rn from the U signals. The software automatically searches the dataset for Radon, and at the same time corrects for elevation and subtracts cosmic background.