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Abstract

In the workflow of airborne gamma-ray spectrometry processing, background correction is the most substantial component. The major part of this correction requires knowing the contribution of atmospheric 222Rn and its daughter products within airborne recorded spectra. To evaluate the atmospheric Rn component, specific calibration flights are needed. Two types of techniques are commonly used: i) upward looking detector technique, ii) spectral ratio technique. For both, the issue lies first in the ability to get the spectra of atmospheric radon and the spectra of uranium from ground. This ability is strongly dependent on local conditions. Two local conditions have to be satisfied: (i) presence in the vicinity of the survey of a wide water surface, (ii) presence of high radon content in the air during calibration flights. BRGM, the French Geological survey, has designed, quality controlled and processed a wide variety of surveys. The experience gained assisted in the monitor atmospheric Rn spectra depending on local condition. Examples from BRGM experience in Tropical forest and temperate climate zones are presented. Constraints and limitations of atmospheric background correction techniques are debated.

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/content/papers/10.3997/2214-4609-pdb.241.truffert_paper1
2009-09-16
2024-03-29
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