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Real-time digital measurement gamma-neutron ratios in mixed radiation �elds arising from standard isotopic sources.

Gamage, K. A. A. and Joyce, M. J. and Hawkes, N. P. (2010) Real-time digital measurement gamma-neutron ratios in mixed radiation �elds arising from standard isotopic sources. In: IEEE NPSS International Workshop on Real-time Measurements, Instrumentation and Control, 2010-01-01, Oshawa, Canada.

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Abstract

The real-time digital assessment of the ratios of gamma rays to neutrons in mixed radiation �elds arising from standard isotopic radioactive sources is presented. A bespoke fast digitizer, which has been developed by the Hybrid Instruments Ltd. (Lancaster, UK), has been used to digitise neutron and gamma events detected by BC501A organic liquid scintillator detector. The digitised raw data for each individual pulse have been collected for four di�erent mixed radiation �elds. These measurements have been taken at the low-scatter facility of National Physical Laboratory (London, UK). Three di�erent algorithms have been used to discriminate the digitised neutrons and gammas in each mixed radiation �eld. These are the digital Charge Comparison Method (CCM),Pulse Gradient Analysis (PGA) and Neutron-Gamma Model Analysis (NGMA). Gamma-to-neutron ratios, often referred to as r-factors, have been calculated and compared for each mixed radiation �eld, for digitally discriminated neutrons and rays providing a basis for reference where future r-factor analysis of isotopic sources is to be carried out, or where reference to these �elds is desired.

Item Type: Conference or Workshop Item (Paper)
Journal or Publication Title: IEEE NPSS International Workshop on Real-time Measurements, Instrumentation and Control
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 39782
Deposited By: Mrs Yaling Zhang
Deposited On: 18 Feb 2011 16:10
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 06:14
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/39782

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