Abstract
Airborne gamma-spectrometry and subsequent radiometric field investigations in central East Greenland have revealed a number of areas of above average radioactivity and a number of radioactive anomalies within these areas. These areas can be divided geologicaIly into: pre-Caledonian crystalline basement, late and post-Caledonian plutonic rocks, Tertiary plutons and areas of intensive faulting and shearing. Areas bordering continental sedimentary formations are envisaged as potential host rocks for epigenetic uranium mineralization. The spectrometer system applied, with a detector volume of 3.7 litres, does not completely satisfy a quantitative evaluation of the spectrometric data recorded and a distinction between major rock units is only possibie from the gross channel count rates.
Highlights
In July and August of 1971 an aerial gamma-spectrometric survey was carried out in central East Greenland from Scoresby Sund (700N) to Hold with Hope (74°N)
The weak negative profile shown by the count rate K' at A indicates that the constants in the stripping equation relating K and K' are overestimated in the calibration of the instrument. Because of this overcorrection and because of the wide statistical fiuctuations often shown by the count rates U', T' and K', the 'stripping' procedure was only used as an aid in distinguishing the radioactive intensities, in areas with high anomalies
A similar increase in count rate levels was observed in the garnetiferous hornblende-biotite gneiss to the south where the proportions between exposed and soil-covered rock follow the same trend as in the north, but in addition, there is a compositional change with an increase in the garnet content to the west
Summary
In July and August of 1971 an aerial gamma-spectrometric survey was carried out in central East Greenland from Scoresby Sund (700N) to Hold with Hope (74°N) (fig. 1). The weak negative profile shown by the count rate K' at A indicates that the constants in the stripping equation relating K and K' are overestimated in the calibration of the instrument Because of this overcorrection and because of the wide statistical fiuctuations often shown by the count rates U', T' and K', the 'stripping' procedure was only used as an aid in distinguishing the radioactive intensities, in areas with high anomalies (see figs II, 12). Instead of making the ratemeter signals independent of the terrain clearance the formula introduces a positive correlation between the height above the surface and the ratemeter signals This ean be explained by the fact that while the radio altimeter measured the distance to the ground below the aircraft, a significant part of the gamma-radiation measured by the detector units was not direction controlled and came from steep sloping surface. Since a variable detector-to-source geometry was a characteristic of the entire survey, no further attempts were made to eliminate or reduce the height effect
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