用高纯锗本身活化法测量NTD-Ge反应堆热中子注量
Measurement of reactor thermal neutron fluence of NTD-Ge by activation High-Purity Ge itself
摘要：
在中子嬗变掺杂锗中，反应堆辐照的热中子注量高达10 $^{18}$ ~n $\cdot$ cm $^{-2}$。出于辐射安全的原因，一般的Co或Au中子通量监测器不能轻易使用。我们首次从实验上证明了测量NTD-Ge自身发射的X射线来确定绝对热中子注量的可行性。建立了微兆气体探测器（MMD）和硅漂移探测器（SDD），用于探测由$^{71}$ Ge衰变产生的9.2 keV和10.3 keV的KX射线。结合GEANT 4计算的探测效率，MMD和SDD给出的中子注量率计算结果具有较好的一致性。
英文摘要：
In neutron transmutation doped germanium, the thermal neutron fluence of reactor irradiation is as high as 10$^{18}$~n$\cdot$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 $^{71}$Ge. 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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