闪烁
氪
材料科学
氙气
放射性核素
多孔性
闪烁体
放射性废物
氡
放射化学
金属有机骨架
探测器
吸附
核化学
化学
核物理学
物理
光学
有机化学
复合材料
作者
Matteo Orfano,Jacopo Perego,Francesca Cova,Charl X. Bezuidenhout,Sergio Piva,Christophe Dujardin,Benoît Sabot,Sylvie Pierre,Pavlo Mai,Christophe Daniel,Silvia Bracco,A. Vedda,Angiolina Comotti,Angelo Monguzzi
出处
期刊:Nature Photonics
[Springer Nature]
日期:2023-05-18
卷期号:17 (8): 672-678
被引量:26
标识
DOI:10.1038/s41566-023-01211-2
摘要
Abstract Natural and anthropogenic gas radionuclides such as radon, xenon, hydrogen and krypton isotopes must be monitored to be managed as pathogenic agents, radioactive diagnostic agents or nuclear activity indicators. State-of-the-art detectors based on liquid scintillators suffer from laborious preparation and limited solubility for gases, which affect the accuracy of the measurements. The actual challenge is to find solid scintillating materials simultaneously capable of concentrating radioactive gases and efficiently producing visible light revealed with high sensitivity. The high porosity, combined with the use of scintillating building blocks in metal–organic frameworks (MOFs), offers the possibility to satisfy these requisites. We demonstrate the capability of a hafnium-based MOF incorporating dicarboxy-9,10-diphenylanthracene as a scintillating conjugated ligand to detect gas radionuclides. Metal–organic frameworks show fast scintillation, a fluorescence yield of ∼40%, and accessible porosity suitable for hosting noble gas atoms and ions. Adsorption and detection of 85 Kr, 222 Rn and 3 H radionuclides are explored through a newly developed device that is based on a time coincidence technique. Metal–organic framework crystalline powder demonstrated an improved sensitivity, showing a linear response down to a radioactivity value below 1 kBq m −3 for 85 Kr, which outperforms commercial devices. These results support the possible use of scintillating porous MOFs to fabricate sensitive detectors of natural and anthropogenic radionuclides.
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