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Thermal neutron imaging with PIN photodiode line scanner and Eu-doped LiCaAlF6 scintillator

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7 Author(s)
Totsuka, D. ; Nihon Kessho Kogaku Co., Ltd., Tatebayashi, Japan ; Yanagida, T. ; Fukuda, K. ; Kawaguchi, N.
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Thermal neutron imaging using Si PIN photodiode line scanner and Eu-doped LiCaAlF6 crystal scintillator has been developed. The pixel dimensions of photodiode are 1.18 mm (width) × 3.8 mm (length) with 0.4 mm gap and the module has 192 channels in linear array. The emission peaks of Eu-doped LiCaAlF6 after thermal neutron excitation are placed at 370 and 590 nm, and the corresponding photon sensitivities of photodiode are 0.04 and 0.34 A/W respectively. Polished scintillator blocks with a size of 1.18 mm (Width) × 3.8 mm (length) × 5.0mm (thickness) were wrapped by several layers of Teflon tapes as a reflector and optically coupled to the photodiodes by silicone grease. JRR-3 MUSASI beam line emitting 13.5 meV thermal neutrons with the flux of 8 × 105 n/cm2s was used for the imaging test. As a subject for imaging, a Cd plate was moved at the speed of 50 mm/s perpendicularly to the thermal neutron beam. Analog integration time was set to be 416.6 μs, then signals were converted by a delta-sigma A/D converter. After the image processing, we successfully obtained moving Cd plate image under thermal neutron irradiation using PIN photodiode line scanner coupled with Eu-doped LiCaAlF6 scintillator.

Published in:

Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE

Date of Conference:

23-29 Oct. 2011