Bismuth-loaded plastic scintillator portal monitors
Bismuth-loaded plastic scintillator portal monitors
复制标题
负载铋的塑料闪烁体入口监视器
DOI：
10.1117/12.2320884
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
C. Hurlbut
中科院分区：
文献类型：
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作者：
N. Cherepy;S. Hok;S. O’Neal;H. P. Martinez;P. Beck;R. Sanner;O. Drury;E. Swanberg;S. Payne;C. Hurlbut
含有8%（重量）元素铋的塑料制冷剂在<1000 keV范围内提供了增强的灵敏度和独特的峰值光谱，通常用于辐射门监测器。铋负载塑料是基于聚乙烯基甲苯与标准单重态氟。它产生约6，000个光子/MeV，最大发射波长为430 nm，衰减时间约为10 ns。在59.5keV和662 keV下，14英寸3的铋塑料闪烁体板的能量分辨率分别为49%和16%。与相同尺寸的标准塑料闪烁体相比，计数率显示在<200 keV范围内灵敏度提高> 5倍。未来基于铋塑料闪烁体的光谱辐射门监测器可以提供中等分辨率的放射性同位素识别光谱。此外，与标准塑料闪烁体配方相比，Bisclad塑料具有出色的耐候性。
Plastic scintillators incorporating 8 weight percent elemental Bismuth offer enhanced sensitivity and distinct photopeak spectra in the <1000 keV range typically used in radiation portal monitors. The Bismuth-loaded plastic is based on polyvinyl toluene with standard singlet fluors. It produces ~6,000 photons/MeV with a maximum emission at 430 nm and a ~10 ns decay. Energy resolution of 49% at 59.5 keV and 16% at 662 keV are obtained for a 14 in3 Bismuth plastic scintillator plate. Count rates compared to standard plastic scintillator of the same size reveal a sensitivity improvement of >5x in the <200 keV range. Future spectroscopic radiation portal monitors based on the Bismuth plastic scintillator could provide moderate resolution spectroscopy for radioisotope identification. In addition, the Bismuth plastic offers outstanding environmental stability to weathering effects, in contrast with standard plastic scintillator formulations.