Title :
A compact neutron detector based on the use of a SiPM detector
Author :
Foster, Mark ; Ramsden, David
Author_Institution :
University of Southampton, Hampshire, UK, SO17 1BJ
Abstract :
This paper explores the performance characteristcs of a compact neutron detector based on the use of a silicon photo-multiplier (SiPM). These devices offer the first true solid-state alternative to traditional photomultiplier tubes in that they provide similar gain and photon-detection efficiency but with the small size and ruggedness of PIN diodes. The performance of a design based on the use of a 23mm diameter LiI crystal, viewed by a 14×14mm square SiPM, has been modeled and tested experimentally using Cf252 fission-neutrons. The design incorporates a 10mm thick HDPE moderator in front of the 3mm crystal and an acrylic light-guide behind it. This provides the ability to detect a 104 n/s source at 25cm in 12s with a confidence level of 93.5%. The gamma-ray rejection capability of the detector is excellent, allowing reliable detection of neutrons in a Co60 gamma-ray background equivalent to a count-rate equivalent to 100kcps in a 2×2” NaI crystal. The impact of temperature changes on the performance of the detector, have also been explored along with methods to compensate for these changes.
Keywords :
Gamma ray detection; Gamma ray detectors; Gas detectors; Neutrons; Photomultipliers; Photonic crystals; Silicon; Solid state circuits; Temperature; Testing;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2008. NSS '08. IEEE
Conference_Location :
Dresden, Germany
Print_ISBN :
978-1-4244-2714-7
Electronic_ISBN :
1095-7863
DOI :
10.1109/NSSMIC.2008.4774758