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Correction and verification of AECL Bonner Sphere response function matrix based on mono-energetic neutron calibration performed at NPL.

Atanackovic, J*; Thomas, D J; Roberts, N J; Witharana, S*; Dubeau, J*; Yonkeu, A* (2014) Correction and verification of AECL Bonner Sphere response function matrix based on mono-energetic neutron calibration performed at NPL. Radiat. Prot. Dosim., 161 (1-4). pp. 216-220.

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Abstract

The AECL Bonner Sphere Spectrometer (BSS) was taken to National Physical Laboratory (NPL) for calibration in mono-energetic neutron fields and bare 252Cf neutron fields. The calibration was performed using ISO-8529 [1] prescribed neutron energies: 0.071, 0.144, 0.565, 1.2, 5 and 17 MeV. A central SP9 proportional counter was also evaluated at NPL thermal neutron calibration facility in order to assess an effective pressure of 3He inside the counter, i.e. number density of 3He atoms. Using these results and methods outlined by Thomas [2], Thomas and Soochak [3] and Wiegel et al. [4], we were able to generate a matrix of a new AECL BSS response functions. The response function matrix is then verified by unfolding spectra corresponding to various neutron fields. Those are: NPL bare 252Cf source, National Institute of Standards and Technology (NIST) bare and heavy water moderated 252Cf source and 241AmBe calibration source located at National Research Council Canada (NRCC). A good agreement was observed with expected neutron fluence rates, as well as derived dosimetric quantities, such as ICRP-74 ambient dose equivalent.

Item Type: Article
Subjects: Ionising Radiation
Ionising Radiation > Neutron Metrology
Identification number/DOI: 10.1093/rpd/nct324
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6369

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