Uranium Content of Thirty-Three Rock Reference Samples Determined by the Delayed Fission Neutron Counting Method

The delayed fission neutron counting method has been used for the analysis of thirty-three international geochemical reference samples for their uranium contents in the range of 0.2 to 1500 ppm. These include three from the Canada Centre for Mineral and Energy Technology, three from Atomic Energy Commission, USA, New Brunswick Laboratory, two from Bhabha Atomic Research Centre, India, fourteen from Centre de Recherches Pétrographiques et Géochimiques and eleven from US Geological Survey. The experimental set up has a detection limit of 0.08 μg and a determination limit of 0.15 μg U. At the lower limit the precision of determination is about 20 percent while at concentrations higher than 1 ppm it is better than 10 percent.