Gamma sensitivity of a ZnS: Ag(6-LiF) wavelength shifting fiber neutron detector in mixed neutron-gamma fields

Garrett Jeff Sykora, Erik M. Schooneveld, Nigel J. Rhodes, Lambert Van Eijck

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

6 Citations (Scopus)

Abstract

Gamma sensitivity of an ISIS linear position sensitive wavelength shifting fiber (WLSF) detector was evaluated at the Reactor Institute Delft (RID) using 60Co and 137Cs sources. The caveat of quoting gamma sensitivity of a detector in pure gamma fields is that detectors are never operated in gamma only environments. A concern is that the sensitivity may increase during neutron measurements due to the increase of pulse pile-up which can occur in ZnS:Ag detectors as the afterglow of a neutron event coincides with a gamma scintillation event causing the gamma event to appear brighter than it actually was. For this reason, gamma sensitivity measurements were performed on a time of flight neutron reflectometer at RID. Results presented here detail neutron efficiency and rate capability of the detector as well as demonstrate gamma sensitivity in pure gamma and mixed fields. It is shown that, in a pure gamma field, the detector has gamma sensitivity on the order of 10 -7310-6 for 60Co and 10-9-10 -8 for 137Cs as a result of detector geometry, fibre coding and signal processing. Gamma sensitivity is unchanged to any statistical significance in a mixed neutron gamma field. A less than 1% gamma-induced dead-timing at neutron rates above 5kHz and high gamma flux on the order of 104 gammas/second/cm2 was observed.

Original languageEnglish
Title of host publication2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record, NSS/MIC 2012
PublisherIEEE
Pages1567-1571
ISBN (Print)978-146732030-6
DOIs
Publication statusPublished - 2012
Event2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record, NSS/MIC 2012 - Anaheim, CA, United States
Duration: 29 Oct 20123 Nov 2012

Conference

Conference2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record, NSS/MIC 2012
CountryUnited States
CityAnaheim, CA
Period29/10/123/11/12

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