Airborne radiometrics (or spectrometry) is the practice of measuring the natural radiation emitted from the surface rocks. In constrast to magnetics it only represents the top few inches of cover and so represents the surficial geology. In natural landscapes only 3 elements are directly detectable: Potassium (K), Uranium (U) and Thorium (Th).
The use of radiometrics in uranium exploration is well known and obvious, but there are many more potential uses that depend on the method's ability to highlight local changes in geochemistry. For example, potassic alteration zones associated with shear hosted gold or massive sulphide deposits can be detected radiometrically.
All of Goldak's spectrometers are state of the art RS-500 series detectors from Radiation Solutions. These 1024 channel systems are highly robust and reliable. We have sufficient detectors to equip 3 aircraft with 12 downward crystals (48 liters or 3,000 cubic inches) or all 4 of our aircraft with 8 downward crystals (32 liters / 2,000 cubic inches), along with a suitable number of upward crystals.
The secret to capturing good quality radiometric data is proper calibration. To that end Goldak has established it's own radiometric calibration range near Saskatoon and acquired a set of concrete calibration pads. The Geological Survey of Canada, which operates the only other calibration facility in Canada, has assisted us in this endeavour and approved our setup for use. To our knowledge no other N American survey provider is as well equipped.