Neutron Activation Analysis: Implications on Precious Metal Reconciliation in the Mining Industry
摘要
Neutron activation analysis, in consideration to the potential use of this technology within the mining and resources industry, represents a new and exciting application of such analytical technique in an industry which, to date, has to date has not utilised such a comprehensive method of elemental analysis. Neutron activation analysis, by either Prompt Gamma Neutron Activation Analysis (PGNA) or Pulsated Fast Thermal Neutron Activation Analysis (PFTNA) specific methodologies, employs thermal neutron activation, essentially a small fission reaction, to excite nuclei of a material sample and whereby the then ejected sample gamma readings are counted by a scintillation detector. These detectors, typically an organic or inorganic thallium activated sodium-iodide crystal contained in a photomultiplier tube, measure electrical energy produced as a result of gamma ray light photon energy exerted by the excited nuclei. These readings are calibrated in response to the known expulsion readings of certain elements and thus Neutron Activation Analysis provides a robust and highly accurate elemental constituent reading for the material being appraised. Despite notable time between the methods discovery in the mid-1930’s, and numerous investigative studies throughout particularly the 1940’s to the 1970’s, the method has not been widely employed in the mining and resources industry and the scope of this investigation is to understand if Neutron Activation may indeed have potential applications going forward for material analysis in this field, particularly in relation to the mining and reconciliation of precious metals.