Characterization of the Multi-Coincident Bismuth Germanate Oxide Spectrometer at the Nuclear Counting Facility

A multi-detector γ-ray spectroscopy system including 3 high-purity germanium (HPGe) detectors has been developed at the Nuclear Counting Facility at Lawrence Livermore National Laboratory. This system operates not only in conventional singles γ-ray detection mode but also incorporates features like coincidence and anti-coincidence techniques. These advanced detection modes can significantly enhance the system’s sensitivity, making it a powerful tool for isotope identification and quantification, especially for complex samples with high background and overlapping peaks. In this re port, we present a comprehensive performance characterization of the Multi-Coincident Bismuth Oxide Spectrometer (MCBOS) using a variety of sample types, including ⁶⁰Co, ⁴⁸Sc, and mixed fission product samples. Each sample provides unique tests for the MCBOS capabilities. Additionally, a GEANT4 model of the MCBOS has been generated to aid with the characterization of the system.. Authors: Ramirez, A. P. D. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]; Parsons-Davis, T. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]; Thomas, K. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]; Weiss, M. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]; Sammis, B. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]. DOE Contract: AC52-07NA27344. Subjects: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Chemistry - Isotopes and radiation sources; Compton-Suppressed; Gamma spectroscopy; HPGe detectors; γγ coincidence system