Measurement and calculations of long-lived radionuclide activity forming in the fast neutron field in some ITER construction steels |
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| Affiliation: | 1. AGH University of Science and Technology, Faculty of Energy and Fuels, Al. Mickiewicza 30, 30-059 Krakow, Poland;2. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059 Krakow, Poland;3. National Centre for Nuclear Research, ul. Sołtana 7, 05-400 Otwock-Świerk, Poland;1. Graduate School of Science, Shizuoka University, Shizuoka, Japan;2. National Institute for Fusion Science, Gifu, Japan;3. Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan;4. Graduate School of Engineering, Hokkaido University, Sapporo, Japan;5. Department of Material Science, Shimane University, Matsue, Shimane, Japan;6. Hydrogen Isotope Research Center, University of Toyama, Toyama, Japan;1. Karlsruhe Institute of Technology (KIT), Institute for Neutron Physics and Reactor Technology (INR), Germany;2. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM-WPT), Germany;3. Indian Institute of Technology Madras (IITM), Department of Mechanical Engineering, India;1. National Fusion Research Institute, Daejeon, Republic of Korea;2. Korea Atomic Energy Research Institute, Daejeon, Republic of Korea;1. CEA, DEN, Saclay, DM2S, SERMA, F-91191 Gif-sur-Yvette, France;2. Incka, 19-21 Rue du 8 mai 1945, F-94110 Arcueil, France;1. Open Joint-Stock Company “N.A. Dollezhall Research and Development Institute of Power Engineering”, (OJSC “NIKIET”), 107140, Malaya Krasnoselskaya 2/8, Moscow, Russian Federation;2. D.V. Efremov Scientific Research Institute of Electrophysical Apparatus, 196641 St. Petersburg, Russian Federation |
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| Abstract: | Measurement and calculations of long-lived gamma-emitting radionuclide activity forming in the fission reactor fast neutron field were done, for some ITER construction steels. The activation was conducted in fast neutron irradiation channel of the MARIA research fission reactor (Poland). The dimensions of steel samples were 10 mm × 10 mm × 1 mm and mass was approximately 0.8 g. The neutron flux density was measured by means of activation foil method and unfolding technique; fraction of neutrons above 1 keV was 95%. The activation lasted 242 h and cooling took 100 days; the mean neutron flux density was 2.9E12 n/(cm2 s) (neutrons above 500 keV are 53% of total) whereas total fluency 2.53E18 cm−2. The activity measurements were done by means of gamma-ray spectrometry. Activity calculations were done by means of FISPACT-II code using the activation libraries EAF-2010 and TENDL-2011 and experimentally determined neutron flux. Measured activity of long-lived gamma emitting radionuclides was, in average, about 6.3 MBq/g 100 days after activation; the dominant radionuclides were 58Co and 54Mn (about 81% and 14% of total activity respectively). The C/E ratio differs for particular radionuclides and is in the range 0.86–0.92 for 51Cr, 0.93–1.21 for 54Mn, 0.77–0.98 for 57Co, 0.91–1.21 for 58Co, 1.17–1.27 for 59Fe, and 1.75–2.44 for 60Co. |
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| Keywords: | ITER materials Neutron activation FISPACT Experimental validation Gamma-ray spectrometry |
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