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Cassette, Philippe,Altzitzoglou, Timotheos,Antohe, Andrei,Rossi, Mario,Arinc, Arzu,Capogni, Marco,Galea, Raphael,Gudelis, Arunas,Kossert, Karsten,Lee, K.B.,Liang, Juncheng,Nedjadi, Youcef,Oropesa Verd Elsevier 2018 Applied radiation and isotopes Vol.134 No.-
<P><B>Abstract</B></P> <P>A comparison of calculations of the activity of a <SUP>3</SUP>H<SUB>2</SUB>O liquid scintillation source using the same experimental data set collected at the LNE-LNHB with a triple-to-double coincidence ratio (TDCR) counter was completed. A total of 17 laboratories calculated the activity and standard uncertainty of the LS source using the files with experimental data provided by the LNE-LNHB. The results as well as relevant information on the computation techniques are presented and analysed in this paper. All results are compatible, even if there is a significant dispersion between the reported uncertainties. An output of this comparison is the estimation of the dispersion of TDCR measurement results when measurement conditions are well defined.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Comparison of calculations of the activity of a <SUP>3</SUP>H<SUB>2</SUB>O LS source from the same experimental data set. </LI> <LI> Data set from a triple-to-double coincidence ratio (TDCR) counter. </LI> <LI> 17 laboratories participated in this exercise. </LI> <LI> Results and relevant information on the computation techniques are presented and analysed. </LI> <LI> All results are compatible but significant dispersion of the reported uncertainties. </LI> </UL> </P>
Structural and radiological characterization of irradiated RBMK-1500 reactor graphite
Elena Lagzdina,Danielius Lingis,Arturas Plukis,Rita Plukiene,Darius Germanas,Andrius Garbaras,Jevgenij Garankin,Arunas Gudelis,Ilja Ignatjev,Gediminas Niaura,Sergej Krutovcov,Vidmantas Remeikis 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.1
This study aims to characterize the irradiated RBMK-1500 nuclear graphite in terms of both structuraland radiological properties. The experimental results of morphological and structural analysis of theirradiated graphite samples by using SEM, Raman spectroscopy as well as the theoretical evaluation ofprimary displacement damage are presented. Moreover, the experimental and theoretical evaluation ofthe neutron flux is provided and the presence of several g emitters in the analyzed graphite samples isassessed. Furthermore, the improved version of rapid analysis method for 14C activity determination isapplied and the experimentally obtained results are compared with calculated ones. Results indicate thatstructural changes are uniform enough in all the analyzed samples. However, the distribution of radionuclidesis non-homogeneous in the irradiated RBMK-1500 reactor graphite matrix. The comprehensiveunderstanding of both structural and radiological characteristics of nuclear graphite is veryimportant when dealing with decision about irradiated graphite waste management strategy or treatmentoptions prior to its final disposal.