Fast-neutron radiolysis of acid water at elevated temperatures |
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| Institution: | 1. KU Leuven, Department of Materials Engineering, Surface and Interface Engineered Materials, Kasteelpark Arenberg 44, 3001 Leuven, Belgium;2. KU Leuven, Department of Chemistry, Division of Molecular Design and Synthesis, Celestijnenlaan 200F, 3001 Leuven, Belgium;3. KU Leuven, Prometheus, Division of Skeletal Tissue Engineering, Herestraat 49, 3000 Leuven, Belgium;4. KU Leuven, Centre for Surface Chemistry and Catalysis, Celestijnenlaan 200F, 3001 Leuven, Belgium;5. KU Leuven, Department of Chemistry, Division of Molecular Imaging and Photonics, Celestijnenlaan 200F, 3001 Leuven, Belgium;6. KU Leuven, Department of Chemistry, Division of Polymer Chemistry and Materials, Celestijnenlaan 200F, 3001 Leuven, Belgium;7. KU Leuven, Department of Imaging & Pathology, Division of Oral and Maxillo-facial Surgery, Kapucijnenvoer 7 blok a, 3000 Leuven, Belgium;1. Division of Nuclear Materials and Fuel, State Power Investment Corporation Research Institute, Beijing 100029, PR China;2. School of Physics and Information Engineering, Jianghan University, Wuhan 430056, PR China;3. School of Physics and Technology, Wuhan University, Wuhan 430072, PR China;4. State Nuclear Bao Ti Zirconium Industry Company, Baoji 721013, PR China;1. Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia;2. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorskogo st., 1, Irkutsk 664033, Russia;3. Enikolopov Institute of Synthetic Polymeric Materials, A foundation of Russian Academy of Sciences, Profsoyuznaya st., 70, Moscow 117393, Russia;1. Geoscience Australia, PO Box 378, Canberra, ACT 2601, Australia;2. Research School of Chemistry, The Australian National University, Canberra, ACT 2600, Australia |
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| Abstract: | Determination of G-values of water decomposition products in acid formed by irradiation of fast neutrons from a reactor YAYOI at elevated temperatures up to 275°C was carried out with a combination of an aerated and a deaerated Fricke dosimeters and a cerium dosimeter. As a first step, the dosimetry of the radiation field revealed that the average energy of the fast neutrons is 0.8 MeV, and over 90% of the total dose absorbed by the aqueous solutions comes from fast neutrons. At room temperature, G-values evaluated for water decomposition products, GH + Ge-aq = 1.25, GOH = 0.68, GH2 = 0.99, GH2O2 = 1.27 and G-H2O = 3.21, coincide with those at initial LET of about 4 eV/Å. With increasing temperature, radical products increase and molecular products decrease, and above 150°C, relative G-values of the products seem to be similar to those obtained in γ-radiolysis at room temperature; however, G-H2O decreases slightly. On the basis of the above results, the temperature effect of water decomposition with fast neutron at elevated temperatures is concluded to be very different from that by γ-rays, where no drastic change in the decomposition pattern with temperature was found. |
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