Bismuth-loaded plastic scintillators for gamma spectroscopy and neutron active interrogation
Bismuth-loaded plastic scintillators for gamma spectroscopy and neutron active interrogation
复制标题
用于伽马能谱和中子主动询问的载铋塑料闪烁体
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
P. Thelin
中科院分区：
文献类型：
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作者：
N. Cherepy;R. Sanner;T. Tillotson;S. Payne;P. Beck;S. Hunter;L. Ahle;P. Thelin
能够伽马光谱的加载铋的塑料闪烁体正在被放大到多个立方英寸大小。由于对单重态和三重态激子的有效捕获，用Ir络合物荧光粉获得了38,888Ph/MeV的高光产额，为3个In3闪烁体提供了662keV的~10%的能量分辨率。尽管在铋负载塑料中，单重态荧光的光产额为~12,888Ph/MeV，分辨率为662keV，分辨率为14%，但~lt；100 ns的快速衰变时间和组成元素的低中子俘获截面适合于在中子主动询问中应用。闪烁光产额不成比例的测量表明，与单线态氟激活塑料相比，Ir络合物激活塑料中的激子-激子湮没被抑制。
Bismuth-loaded plastic scintillators capable of gamma spectroscopy are being scaled up to multiple cubic inch sizes. High light yields of >38,888 Ph/MeV are obtained with Iridium-complex fluors due to efficient harvesting of both singlet and triplet excitons, providing energy resolution of ~10% at 662 keV for 3 in3 scintillators. Although singlet fluors provide a poorer light yield of ~12,888 Ph/MeV and resolution at 662 keV of 14% in the Bismuth-loaded plastics, the fast decay time of <;100 ns and the low neutron capture cross-sections of the constituent elements lend themselves to applications in neutron active interrogation. Measurements of the scintillation light yield non-proportionality reveal that exciton-exciton annihilation is suppressed in Iridium-complex activated plastic, in contrast with the singlet fluor activated plastic.