Absolute standardization of 57 Co and analysis of the results obtained in two international comparisons.

Autor: Sahagia M; Horia Hulubei National Institute of R&D for Physics and Nuclear Engineering, IFIN-HH, Reactorului str.30,Magurele, Ilfov RO 077125, Romania. Electronic address: msahagia@nipne.ro., Luca A; Horia Hulubei National Institute of R&D for Physics and Nuclear Engineering, IFIN-HH, Reactorului str.30,Magurele, Ilfov RO 077125, Romania., Antohe A; Horia Hulubei National Institute of R&D for Physics and Nuclear Engineering, IFIN-HH, Reactorului str.30,Magurele, Ilfov RO 077125, Romania., Ioan MR; Horia Hulubei National Institute of R&D for Physics and Nuclear Engineering, IFIN-HH, Reactorului str.30,Magurele, Ilfov RO 077125, Romania.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2018 Oct; Vol. 140, pp. 146-150. Date of Electronic Publication: 2018 Jul 06.
DOI: 10.1016/j.apradiso.2018.07.005
Abstrakt: The absolute standardization of Co-57 by the 4π(PC)-γ coincidence method, in efficiency extrapolation variant, is presented. An original, improved method, based on the use of the equivalent decay scheme, was applied; apart from the enhancement of efficiency, a diminution of extrapolation slope was obtained, lowering the extrapolation uncertainty. The results obtained in the participation at the supplementary comparison CCRI(II)-S6.Co-57 and at the key comparison code BIPM.RI(II)-K1.Co-57 are presented. The method allows to simplify the treatment of 56 Co and 58 Co impurities' correction, which influences significantly the measurements in a CENTRONIC type ionization chamber. An example of treatment of this mixture, where the influence of impurities on results was analyzed, will be presented.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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