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Measurements of Cesium Radioisotopes in Cesium Compounds
Y.D.Kim,U.K.Kang,J.M.Choi,H.K.Jang,R.K.Jain,S.C.Kim,S.K.Kim,T.Y.Kim,이현수,S.E.Lee,H.Park,I.H.Park,원은일,H.S.Won,H.Y.Yang,M.S.Yang,M.J.Hwang,H.J.Kim,Y.J.Kwon,J.H.Lee,I.S.Cho,D.H.Choi,S.H.Noh,I.T.Yu,J.H.Kim 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.3
We have measured impurity levels of radioactive isotopes, especially 137Cs and 134Cs , in various cesium compounds using HPGe detectors for the rst time. The 137Cs contamination levels of cesium iodide (CsI) powder samples that are commercially available were between 9.7 mBq/kg and 80 mBq/kg. With these levels of the contamination, 137Cs will be the most serious background source in the low energy region E < 100 keV for CsI crystal. An upper limit of the 137Cs contamination level in pollucite powder, from which CsI powders are extracted, was set to be 5.8 mBq/kg at a 90 % condence level. It should be possible to fabricate the CsI crystal with much less 137Cs contamination than the currently available CsI crystal.
이현수(H.S. Lee),윤주호(J. H. Yoon),이소영(S. Y. Lee),윤장원(J. W. Yoon),안경관(K.K. Ahn) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.5
The topic of this paper is regenerative braking which is one part of energy saving of excavator. A study to maximize energy-saving-efficiency is conducted. Firstly, this paper provides mathematical modeling of regenerative braking process in detail and analyzes that in view of energy saving efficiency. Subsequently, a novel regenerative braking algorithm is proposed by using the modeling. Finally, the improvement of energy saving efficiency by proposed algorithm is verified by simulation program, AMESim.