
X-ray technology could revolutionise gold detection
A new x-ray technique developed by the CSIRO could save the Australian gold mining industry hundreds of millions of dollars each year, by detecting gold that would otherwise go unseen. The technique uses powerful x-rays to rapidly and accurately detect small amounts of gold in ore samples and is much more effective than traditional chemical analysis methods. The CSIRO, together with Canadian electron accelerator and manufacturer Mevex, undertook a pilot study on the use of gamma-activation analysis (GAA). The technique involves scanning mineral samples – typically weighing about 500 grams – using high-energy x-rays similar to those used in medical imaging. The x-rays activate any gold in the sample, and the activation is then picked up using a sensitive detector.…