DSpace at EWHA: Production of low radioactivity CsI(Tl) crystals for WIMP searches

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Production of low radioactivity CsI(Tl) crystals for WIMP searches

Authors: Kim Y.D.; Hahn I.S.; Hwang M.J.; Jin L.; Kang W.G.; Kim H.J.; Kim S.C.; Kim S.K.; Kim S.Y.; Kim T.Y.; Kwak J.W.; Kwon Y.J.; Lee E.K.; Lee H.S.; Lee J.I.; Lee J.Y.; Lee M.J.; Myung S.S.; Park H.; Schiedt A.; Yang H.Y.; Zhu J.J.

Abstract: We have extensively studied the mechanism of the 137Cs and 134Cs contamination in CsI compounds. The nuclei 137Cs and 134Cs in various samples have been studied using a HPGe detector at deep underground. The main source of the 137Cs contamination in CsI powder was desolved 137Cs in the water used in the chemical process of cesium extraction at company side. We also found that 134Cs was produced mainly from 133Cs by neutron capture. We have successfully produced CsI powder containing no more than 2 mBq/kg of 137Cs by using only ultra-pure water for whole extraction process from raw ore(pollucite). © 2005 American Institute of Physics.