Construction of Radiometric Calibration Pads

Radiometric data give information about the amounts of potassium, uranium and thorium that are present on the surface of the earth (Heiland 1963). This information is measured as a spectrum of the gamma radiation that is emitted as a result of decay in radioactive elements. Each element emits a unique amount of gamma radiation, and by counting the radiation at each energy level, a spectrum can be built up that can be related to the ground concentrations of potassium, uranium and thorium.