Journal article

Silicon sensors with pyramidal structures for neutron imaging

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Author list: Petersson, Sture; Slavicek, Tomas; Thungström, Göran

Publication year: 2014

Journal: Journal of Instrumentation

Start page: Art. no. C04011

ISSN: 1748-0221

eISSN: 1748-0221

DOI: http://dx.doi.org/10.1088/1748-0221/9/04/C04011

View additional information: View in Web of Science


Abstract

Neutron detection is a valuable tool in nuclear science research, homeland security, quality assurance in nuclear plants and medical applications. Recent developments and near future instrumentations in neutron imaging have a need for sensors with high spatial resolution, dynamic range, sensitivity and background discrimination. Silicon based neutron detectors can potentially fulfil these requirements. In this work, pad and pixel detectors with pyramidal micro-structures have been successfully fabricated that should have an improved detection efficiency when compared to conventional planar devices. Titanium di-boride (TiB2) and lithium fluoride (LiF) were deposited as the neutron converters. Excellent electrical performances were measured on both simple pad and pixel detectors. A selection of pad detectors was examined by alpha spectroscopy. Measurement with thermal neutrons from a 241Am-Be source shows an improvement in relative efficiency of up to 38% when compared to conventional planar devices.


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