Aerial gamma-ray surveying reflects geochemical variations of potassium, uranium and thorium in the upper 30 cm of the Earth's surface.

Radiometric surveying thus provides a powerful, cost-effective means of mapping outcropping and subcropping geology. In addition to basic lithological information, radiometric data is used directly to identify uranium mineralisation; map alteration zones (e.g. porphyry copper and shear zone hosted gold); and prioritise and discriminate Fe-oxide-Cu-Au, granophile deposits and mafic targets.

Uranium Data

Radiometric Uranium Data

Uranium (ppm) data from a survey flown over a uranium deposit at 20m (right) and 80m (left), line spacing = 50m. The comparative surveys illustrate the improvement in resolution gained through low level survey.

As part of the XPlorer™ package, NRG offers high resolution, full-spectrum radiometric data as a complement to its industry-leading gradient enhanced magnetic data. The reduced survey height offered by a helicopter platform significantly improves signal to noise ratio which in turn enables a higher sampling rate of 2 Hz.

This, coupled with slower survey speed, results in a down-line sample window of approximately 20 m which is more than a three-fold improvement on standard fixed-wing systems.

A full 1024 in³ NaI crystal pack is employed with 256 channel recording. Full spectral processing (NASVD) is applied to all data as a standard.

XPlorer™ systems run new generation Radiation Solutions spectrometers in place of older GR820s which have a number of technical advantages. Most importantly the spectrometers are able to sample at faster rates effectively opening the door to high resolution survey. For RSI technical details please click here.