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Organic and inorganic carbon-14 in discharges of JSC Institute of Nuclear Materials
E.I. Nazarov,A.A. Ekidin,A.V. Kruzhalov,M.E. Vasyanovich,A.I. Lysikov,P.N. Kalinkin,I.M. Russkikh Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6
The aim of the study is the activity concentration measurements of organic and inorganic <sup>14</sup>C in the discharges of JSC "Institute of Nuclear Materials" (INM). In INM the research water-water reactor "IVV-2M" is operating. Collecting of <sup>14</sup>C species was performed using a <sup>14</sup>C sampler with a chromium oxide and platinum catalysts at different temperatures: 400, 550 and 700 ℃. The measurements of <sup>14</sup>C activity were performed using a liquid scintillation counter. The share of organic <sup>14</sup>C in emissions ranged from 0.30 to 0.84 and depends on the temperature of the catalyst, core structure and reactor operating mode.
Study of atmosphere parameters of the IVV-2M reactor hall
Vasyanovich M.E.,Zhukovsky M.V.,Nazarov E.I.,Russkikh I.M. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.11
The paper presents the results of a study of radioactive noble gases and from decay products in the atmosphere of the reactor hall of the research nuclear reactor IVV-2M. The distribution of short-lived 88Rb and 138Cs activity by sizes of aerosol particles was measured in the range of 0.5e1000 nm. It is shown that radioactive aerosols are characterized by three main modes with AMTD 2e3 nm, 7e15 nm and 400 nm. About 70% of aerosol activity is due to 88Rb. The equilibrium factor between 88Kr and 88Rb is 0.2 ± 0.1. The total concentration of aerosols particles was measured using an aerosol diffusion spectrometer. The value of unattached fraction of radioactive aerosols in the atmosphere of reactor hall IVV- 2M was f ¼ 0.15e0.25 at the average total aerosol particles concentration from 20,000 cm3 to 53,000 cm3.
Van Thuong Ta,Tashlykov O.L.,Shironina A.M.,Voronin I.P.,Kuvshinova E.V.,Pyltsova D.O.,Nazarov E.I.,Mahmoud K.A. 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.5
The current work deals with investigation of the gamma ray shielding properties for various natural stones from Vietnam to be applied in the radiation shielding applications. The physical and chemical properties affecting the γ-ray shielding performance were examined. The MH-300A density meter was utilized to measure the density (ρ, g/cm3) of stone samples, as well as the chemical composition of Vietnamese natural stones was measured using the X-ray fluorescence analyzer (Olympus X-5000). The study shows that the increase in Fe + Ca concentrations within the stone samples increases their density (from 2.48 to 2.86 g/cm3) accompanied with a reduction in the porosity (Φ, %) (from 8.23 to 0.15%) and water absorption (K, %) (from 3.42 to 0.05%) factors. Additionally, the increase in Fe + Ca concentrations increases the linear attenuation coefficient (μ, cm 1) of the studied stones, where the Vietnamese marble stone (M 3.1) with the highest Fe + Ca concentration (65.97 wt%) has the highest linear attenuation coefficient which varied between 3.781 and 0.155 cm 1 with raising the gamma ray energy between 0.040 and 1.332 MeV.