Measurement of reactor thermal neutron fluence of NTD-Ge by activation High-Purity Ge itself

2023/02/25 by Zhao, Kangkang, Xue, Mingxuan, Peng, Haiping +4
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det) #Nuclear Experiment (nucl-ex)

paper · doi:10.48550/arxiv.2302.12982

Abstract

In neutron transmutation doped germanium, the thermal neutron fluence of reactor irradiation is as high as 10¹⁸~n⋅cm^-2. For radiological safety reasons, general Co or Au neutron flux monitors cannot be easily used. We have experimentally demonstrated the feasibility of measuring the X-rays emitted by the NTD-Ge itself to determine the absolute thermal neutron fluence for the first time. A Micro-Megas Detector (MMD) and a Silicon Drift Detector (SDD) are set up to detect the tagging KX-rays with 9.2 keV and 10.3 keV cascading from the decays of ⁷¹Ge. Combined the detection efficiencies calculated by GEANT4, neutron fluence results given with proper accuracy by MMD and SDD are in a good agreement with each other.

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