A prototype detection system for atmospheric monitoring of xenon radioisotopes

作者：Czyz Steven A^*; Farsoni Abi T; Ranjbar Lily

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2018, 884: 64-69.

DOI：10.1016/j.nima.2017.10.044

• Radioxenon
• Beta-gamma coincidence
• Coplanar CZT
• SiPMs
• Nuclear explosion monitoring

The design of a radioxenon detection system utilizing a CdZeTe crystal and a plastic scintillator coupled to an array of SiPMs to conduct beta-gamma coincidence detection for atmospheric radioxenon monitoring, as well as the measurement of Xe-135 and Xe-133/133m, have been detailed previously. This paper presents recent measurements of Xe-133/133m and Xe-131m and the observation of conversion electrons in their coincidence spectra, as well as a 48-hour background measurement to calculate the Minimum Detectable Concentration (MDC) of radioxenon isotopes in the system. The identification of Regions of Interest (ROIs) in the coincidence spectra yielded from the radioxenon measurements, and the subsequent calculation of the MDCs of the system for Xe-135, Xe-133/133m, and Xe-131m, are also discussed. Calculated MDCs show that the detection system preforms respectably when compared to other state of the art radioxenon detection systems and achieved an MDC of less than 1 mBq/m(3) for Xe-131m, Xe-133, and Xe-133m, in accordance with limits set by the Comprehensive Nuclear-Test-Ban Treaty (CTBTO). The system also provides the advantage of room temperature operation, compactness, low noise operation and having simple readout electronics.

• 出版日期2018-3-11