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GYAGG/ 6 LiF composite scintillation screen for neutron detection
A. Fedorov,I. Komendo,A. Amelina,E. Gordienko,V. Gurinovich,V. Guzov,G. Dosovitskiy,V. Kozhemyakin,D. Kozlov,A. Lopatik,V. Mechinsky,V. Retivo,V. Smyslova,A. Zharova,M. Korzhik 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
Composite scintillation screens on a base of Gd1.2Y1.8Ga2.5Al2.5O12:Ce (GYAGG) scintillator have beenevaluated for neutron detection. Besides the powdered scintillator, the composite includes 6LiF particles;both are merged with a binder and deposited onto the light-reflecting aluminum substrate. Resultsobtained demonstrates that screens are suitable for use with a silicon photomultiplier readout to create aprospective solution for a compact and low-cost thermal neutron sensor. Composite GYAGG/6LiF scintillationscreen shows a pretty matched sensitivity and g-background rejection with a widely usedZnS/6LiF screens however, possesses forty times faster response.
Magnetic Properties of Epitaxial [Pd/Co/CoO]n Superlattices
A. G. Kozlov,A. F. Shishelov,A. A. Turpak,M. A. Kuznetsova,A. V. Prikhodchenko,A. V. Davydenko,E. V. Tarasov,N. N. Chernousov,A. V. Ognev,A. S. Samardak 한국자기학회 2024 Journal of Magnetics Vol.29 No.1
Here, the investigation of the structural features, magnetic properties, and domain structure of multilayer superlattices prepared by molecular beam epitaxy and partial oxidation of magnetic layers is presented. The influence of the number of repetitions on the morphology of the interfaces is investigated. It is also shown that the epitaxial growth of the Pd and Cu layers is retained when growing over oxide layers. The paper presents the dependences of the coercive force and magnetic anisotropy energy and explains their behavior. The domain structure is studied by the magnetooptical Kerr effect and magnetic force microscopy. The possibilities of modifying the domain structure into skyrmion lattices by local action with a magnetic probe and without an external magnetic field are demonstrated.
Sensitivity of GAGG based scintillation neutron detector with SiPM readout
Fedorov, A.,Gurinovich, V.,Guzov, V.,Dosovitskiy, G.,Korzhik, M.,Kozhemyakin, V.,Lopatik, A.,Kozlov, D.,Mechinsky, V.,Retivov, V. Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.10
Here we report on the first results of sensitivity evaluation of the gadolinium-aluminum-gallium- garnet (GAGG) scintillation detector with SiPM readout to fast and slow neutrons and, to the natural background and Co-60 γ-radiation as well. Data on sensitivity were obtained using certified dosimetry benches, so it can be utilized in the calculation of detection limits of neutron flux with such type of detectors. It was concluded that use of GAGG scintillator has a good prospect for neutron monitoring in different parts of nuclear research reactors and power plants.
Carbon Nanotubes Based Methanol Sensor for Fuel Cells Application
Kim, D. W.,Lee, J. S.,Lee, G. S.,Overzet, L.,Kozlov, M.,Aliev, A. E.,Park, Y. W.,Yang, D. J. American Scientific Publishers 2006 Journal of Nanoscience and Nanotechnology Vol.6 No.11
<P>An electrochemical sensor is built using vertically grown multi-walled carbon nanotubes (MWNTs) micro-array to detect methanol concentration in water. This study is done for the potential use of the array as methanol sensor for portable units of direct methanol fuel cells (DMFCs). Platinum (Pt) nanoparticles electro-deposited CNTs (Pt/CNTs) electrode shows high sensitivity in the measurement of methanol concentration in water with cyclic voltammetry (CV) measurement at room temperature. Further investigation has also been undertaken to measure the concentration by changing the amount of the mixture of methanol and formic acid in water. We compared the performance of our micro array sensor built with Pt/CNTs electrodes versus that of Pt wire electrode using CV measurement. We found that our Pt/CNTs array sensor shows high sensitivity and detects methanol concentrations in the range of 0.04 M to 0.10 M. In addition, we found that co-use of formic acid as electrolyte enables us to measure up to 1.0 M methanol concentration.</P>
3-Dimensional Magnetostatic Interactions in Controllable Magnetic Fe/Au Barcode Nanowire Arrays
Eunjin Jeong,Aleksei Yu. Samardak,Yoo Sang Jeon,Vadim Yu. Samardak,Aleksei G. Kozlov,Kirill A. Rogachev,Alexey V. Ognev,Gyu Won Kim,Min Jun Ko,Alexander S. Samardak,Young Keun Kim 한국자기학회 2022 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2