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Abstract
An extensive programme of research has been conducted for scintillation liquids and plastics capable of neutron–gamma discrimination for deployment in future passive and active Homeland Security systems to provide protection against radiological and nuclear threats. The more established detection materials such as EJ-301 and EJ-309 are compared with novel materials such as EJ-299-33 and p-terphenyl. This research also explores the benefits that can be gained from improvements in the analogue–to–digital sampling rate and sample bit resolution. Results are presented on the Pulse Shape Discrimination performance of various detector and data acquisition combinations and how optimum configurations from these studies have been developed into field-ready detector arrays. Early results from application-specific experimental configurations of multi-element detector arrays are presented.
Highlights
The study into Pulse Shape Discrimination (PSD) performance in different detector geometries and configurations was born out of the desire to construct large area, costeffective fast neutron detectors
Examples of such materials are EJ-301 and EJ-309, in which neutrons produce a light pulse that has a longer tail than gamma rays due to the way the particles give up their energy in the liquid.[1]
The charge pulse from the detector photomultiplier tube (PMT) anode output is captured by a digitizer that converts the analogue charge pulse to a digital representation, which is subsequently processed for energy and PSD
Summary
The study into Pulse Shape Discrimination (PSD) performance in different detector geometries and configurations was born out of the desire to construct large area, costeffective fast neutron detectors. There are several scintillation materials available that have the property of yielding light pulses of different shape for different interacting particle types. Examples of such materials are EJ-301 and EJ-309, in which neutrons produce a light pulse that has a longer tail than gamma rays due to the way the particles give up their energy in the liquid.[1]. This is an Open Access article published by World Scientific Publishing Company. Over the past four years, AWE has had a specific programme of work investigating the performance of these types of PSD scintillators and in particular how they may be applied to passive detection (e.g. radiation portal at a port or choke point) and active detection (typically targeted to primary and secondary inspection at a port)
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