NDLI: Detection of nuclear material with dual neutron

Content Provider	IEEE Xplore Digital Library
Author	Mukhopadhyay, S. Glodo, J. Hawrami, R. Shirwadkar, U. van Loef, E. Higgins, W.M. Churilov, A.V. Shah, K.S.
Copyright Year	2010
Description	Author affiliation: Radiation Monitoring Devices, Watertown, MA (Mukhopadhyay, S.; Glodo, J.; Hawrami, R.; Shirwadkar, U.; van Loef, E.; Higgins, W.M.; Churilov, A.V.; Shah, K.S.)
Abstract	Gamma-ray signatures are generally used for detecting nuclear materials. It is difficult to distinguish gammas from backgrounds and innocent radiological materials, which can result in high false alarm rate. Dual neutron-gamma detectors for detecting illegally trafficked nuclear materials have a potential to reduce the false alarm rate. Elpasolite scintillator Cs2LiYCl6 (CLYC) doped with $Ce^{3+}$ presented in this work can detect both neutrons and gammas efficiently. In this work we will discuss results to show the ability of CLYC to detect thermal neutrons efficiently with very high gamma discrimination rate. Excellent energy resolution that can be obtained with CLYC is as good as 3.9 % for 662 keV (FWHM). On the other hand, the presence of $^{6}Li$ which has an acceptable cross-section for thermal neutron capture, allows this material to detect thermal neutrons as well. In the energy spectrum, the full energy thermal neutron peak typically appears above 3 MeV gamma-equivalent energy (GEE). Thus very effective pulse height discrimination (PHD) can be implemented with these materials by rejecting gamma-ray events below 3 MeV. Apart from PHD, using pulse-shape discrimination (PSD) it is also possible to separate neutron and gamma events. Preliminary measurements using NIM modules were performed, the method frequently used for organic scintillators to estimate the gamma rejection ratio (GRR). Moreover, we have also tested this scintillator with Si-based optical sensors, such as avalanche photo diodes (APD), and solid state photo multipliers (SSPM). The results clearly show that CLYC can be used for thermal neutron detection with these devices. This gives the opportunity for developing efficient, compact, and low-cost radiation detectors that can be deployed in large numbers.
Starting Page	404
Ending Page	409
File Size	2867791
Page Count	6
File Format	PDF
ISBN	9781424460472
e-ISBN	9781424460489
DOI	10.1109/THS.2010.5654946
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-11-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Crystals Neutrons Logic gates Electron tubes Helium
Content Type	Text
Resource Type	Article

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