Transparent lithium loaded plastic scintillators for thermal neutron detection

The fabrication of a series of novel, optically transparent, bulk plastic scintillators loaded with lithium methacrylate, and incorporating 2,5-diphenyloxazole and 5-phenyl-2-[4-(5-phenyl-1,3-oxazol-2-yl)phenyl]-1,3-oxazole fluorescent centres, is described. The attenuation length, photoluminescence...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2013-02, Vol.701, p.58-61
Main Authors: Breukers, R.D., Bartle, C.M., Edgar, A.
Format: Article
Language:English
Subjects:
Accelerators
Attenuation
Beams (radiation)
Lithium
Lithium loaded
Luminescence
Photoluminescence
Plastic scintillator
Spectrometers
Thermal neutron detection
Thermal neutrons
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Summary:The fabrication of a series of novel, optically transparent, bulk plastic scintillators loaded with lithium methacrylate, and incorporating 2,5-diphenyloxazole and 5-phenyl-2-[4-(5-phenyl-1,3-oxazol-2-yl)phenyl]-1,3-oxazole fluorescent centres, is described. The attenuation length, photoluminescence, and both gamma ray and thermal neutron scintillation responses were compared over a range of lithium methacrylate concentrations. The maximum concentration corresponded to a weight percentage of lithium-6 of 0.63%. The photoluminescence shows a composite 2,5-diphenyloxazole and 5-phenyl-2-[4-(5-phenyl-1,3-oxazol-2-yl)phenyl]-1,3-oxazole broad band with vibronic features in the range 350–500nm, and lifetimes in the range 0.9–2.7ns. An increasing luminescence in a thermal neutron beam with increasing lithium-6 content is demonstrated.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2012.10.080