The Comprehensive Nuclear-Test-Ban Treaty (CTBT) has seen the installation of a global network of highly sensitive detection equipment, designed with the aim of detecting a nuclear explosion. The International Monitoring System (IMS) incorporates a number of technologies for detection of particulate and noble gas radionuclides, including high resolution gamma-ray spectroscopy. As a result of the International Noble Gas Experiment (INGE), beta-gamma coincidence measurements have become an important part of the Verification Regime, delivering greatly improved detection limits for measurements of radioxenon isotopes of interest. The UK CTBT Radionuclide Laboratory (GBL15), operated by scientists at AWE Aldermaston, has a history of research and development in radiometric science, focussing on signatures from post-detonation of a nuclear device.
A PhD studentship in collaboration with the University of Surrey has been established to develop a beta-gamma detection system for use in GBL15. This presentation covers the theory of this method of detection and the results of preliminary work in developing a high resolution coincidence detection system.