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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.