Airborne magnetic and gamma-ray data acquisition

Current aeromagnetic data acquisition has benefited from improvements in measurement precision and compensation systems for removing with closer line spacing than previously, and this has stimulated a demand for lower survey altitudes with flight heights of the order of 60-80 m now common. Radiometric recording of 256 channels of gamma-ray data is now virtually standard and in-flight stabilisation of these systems has improved markedly. Digital acquisition systems are now designed to facilitate both in-flight and post-flight verification of the data. This article briefly outlines he history of the acquisition equipment used in the earlier surveys and details the current sate-of-the-art technology and methodology used in airborne magnetic and gamma-ray surveys. 9 refs., 1 tab., 2 figs