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In neutron transmutation doped germanium, the thermal neutron fluence ofreactor irradiation is as high as 10$^{18}$~n$\cdot$cm$^{-2}$. For radiologicalsafety reasons, general Co or Au neutron flux monitors cannot be easily used.We have experimentally demonstrated the feasibility of measuring the X-raysemitted by the NTD-Ge itself to determine the absolute thermal neutron fluencefor 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 keVcascading from the decays of $^{71}$Ge. Combined the detection efficienciescalculated by GEANT4, neutron fluence results given with proper accuracy by MMDand SDD are in a good agreement with each other.

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