材料科学
闪烁体
闪烁
中子探测
气凝胶
中子
中子俘获
中子温度
钙钛矿(结构)
光电子学
纳米技术
核物理学
光学
探测器
物理
化学
结晶学
作者
Pei Li,W. S. Cheng,Yifan Zhou,Dong Zhao,Jun Li,Lingxi Li,Xiaoping Ouyang,Bo Liu,Wenbao Jia,Qiang Xu,Kostya Ostrikov
标识
DOI:10.1002/adma.202209452
摘要
State-of-the-art thermal neutron scintillation detectors rely on rare isotopes for neutron capture, lack stability and scalability of solid-state scintillation devices, and poorly discriminate between the neutron and gamma rays. The boron nitride (BN)-CsPbBr3 perovskite nanocomposite aerogel scintillator enables discriminative detection of thermal neutrons, features the largest known size (9 cm across), the lowest density (0.17 g cm-3 ) among the existing scintillation materials, high BN (50%) perovskite (1%) contents, high optical transparency (85%), and excellent radiation stability. The new detection mechanism relies on thermal neutron capture by 10 B and effective energy transfer from the charged particles to visible-range scintillation photons between the densely packed BN and CsPbBr3 nanocrystals. Low density minimizes the gamma ray response. The neutrons and gamma rays are discriminated by complete decoupling of the respective single pulses in time and intensity. These outcomes open new avenues for neutron detection in resource exploration, clean energy, environmental, aerospace, and homeland security applications.
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