Relocation and Commissioning of the Prompt Gamma Facility at McMaster Nuclear Reactor

Abstract

In order to install a new instrument at a beam port of the McMaster Nuclear Reactor, the 30-year-old Prompt Gamma Neutron Activation Analysis (PGNAA) facility was relocated to a different beam port. Modifications were made to the shielding components. Pneumatic transfer facilities were re-routed and modernized. In addition, beam line components, including thermalizing sapphire and silicon crystals, were adapted for the new location. The age of the facility presented challenges. While unknown during the planning stages, after 30 years of irradiation, the dose rates of beam line components were found to be manageable. The configuration and number of beam line components were also unknown. The facility was re-instated and commissioned with neutron radiography used to ascertain correct positioning of samples in the beam line. The sensitivity of the PGNAA in its new location is less than at the old beam port, but counting times have been increased to compensate. Future optimization activities are discussed.