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- Title
Correction and verification of AECL Bonner Sphere response matrix based on mono-energetic neutron calibration performed at NPL.
- Authors
Atanackovic, J.; Thomas, D. J.; Roberts, N. J.; Witharana, S.; Dubeau, J.; Yonkeu, A.
- 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 mono-energetic radiations were performed using ISO-8529 prescribed neutron energies: 0.071, 0.144, 0.565, 1.2, 5 and 17 MeV. A central SP9 proportional counter was also evaluated at the NPL thermal neutron calibration facility in order to assess an effective pressure of 3He inside the counter, i.e. number density of 3He atoms. Based on these measurements and methods outlined by Thomas and Soochak, a new BSS response matrix was generated. The response matrix is then verified by unfolding spectra corresponding to various neutron fields. Those are NPL bare 252Cf source, National Institute of Standards and Technology bare and heavy water moderated 252Cf source and 241AmBe calibration source located at National Research Council. A good agreement was observed with expected neutron fluence rates, as well as derived dosimetric quantities, such as International Commission on Radiological Protection-74 ambient dose equivalent.
- Subjects
BONNER sphere spectrometers; MONOENERGETIC radiation; NEUTRON measurement; NATIONAL Physical Laboratory (Great Britain); THERMAL neutrons; NEUTRONS spectra; NATIONAL Institute of Standards &; Technology (U.S.); RADIATION dosimetry
- Publication
Radiation Protection Dosimetry, 2014, Vol 161, Issue 1-4, p216
- ISSN
0144-8420
- Publication type
Article
- DOI
10.1093/rpd/nct324