f Advances in airborne gamma-ray system design for geophysical and environmental applications

The purpose of this paper is to acquaint current users of Gamma- Ray equipment with the latest technology in this specialised field. Wherever possible the inforrnation is presented with a bias to Airborne applications, but of course the techniques discussed are directly applicable to Ground or Borehole applications. The presentation tries to balance an accurate explanation of these methods, with time allotted, so out of necessity, a somewhat simplified description has been used where possible.