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Calibration of low-level beta-gamma coincidence detector systems for xenon isotope detection
K Khrustalev1, J S E Wieslander1, M Auer1
1CTBTO Preparatory Commission, P.O. Box 1200, 1400 Vienna, Austria.
Abstract:
The beta-gamma coincidence detector systems used for the measurement of the CTBT-relevant xenon isotopes (Xe-131m, Xe-133m, Xe-133 and Xe-135) in the International Monitoring System network and in the On-Site Inspection are reviewed. These detectors typically consist of a well-type or bore-through NaI crystal into which a measurement cell, serving also as a sample container, is inserted. This work describes the current calibration procedure for energy, resolution and efficiency, implementation challenges, availability and uncertainties of the specific nuclear decay data and the path forward to full calibration validation using GEANT4.
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