Synthesis of bulk-size transparent gadolinium oxide-polymer nanocomposites for gamma ray spectroscopy.
Synthesis of bulk-size transparent gadolinium oxide-polymer nanocomposites for gamma ray spectroscopy.
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DOI：
10.1039/c2tc00245k
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发表时间：
2013-03-14
期刊：
影响因子：
--
通讯作者：
Pei Q
中科院分区：
文献类型：
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作者：
Cai W;Chen Q;Cherepy N;Dooraghi A;Kishpaugh D;Chatziioannou A;Payne S;Xiang W;Pei Q
负载重元素的聚合物复合材料长期以来一直被提出用于探测闪烁时的高能X射线和γ射线。先前报道的块状复合材料发光器由于荧光猝灭和不透明导致的光输出减少而取得了有限的成功。我们证明了一个透明的纳米复合材料的合成，包括氧化钆纳米晶体均匀分散在大尺寸的样品中，在一个高负载量。成功地部署了避免纳米复合材料中的发光猝灭和不透明性的策略，这导致了高达27 000/MeV的放射性发光光产额，约为标准商业塑料发光器的两倍。纳米复合材料整料（14毫米直径3毫米厚）与31重量%负载的纳米晶体产生的Cs-137 γ（662千电子伏）的光电峰与11.4%的能量分辨率。
Heavy element loaded polymer composites have long been proposed to detect high energy X- and γ-rays upon scintillation. The previously reported bulk composite scintillators have achieved limited success because of the diminished light output resulting from fluorescence quenching and opacity. We demonstrate the synthesis of a transparent nanocomposite comprising gadolinium oxide nanocrystals uniformly dispersed in bulk-size samples at a high loading content. The strategy to avoid luminescence quenching and opacity in the nanocomposite was successfully deployed, which led to the radioluminescence light yield of up to 27 000/MeV, about twice as much as standard commercial plastic scintillators. Nanocomposites monoliths (14 mm diameter by 3 mm thickness) with 31 wt% loading of nanocrystals generated a photoelectric peak for Cs-137 gamma (662 keV) with 11.4% energy resolution.