We have extensively studied the mechanism of the Cs137 and Cs134 contamination in CsI compounds. The nuclei Cs137 and Cs134 in various samples have been studied using a HPGe detector at deep underground. The main source of the Cs137 contamination in CsI powder was water dissolved Cs137 used in the chemical process of cesium extraction at company side. We also found that Cs134 was produced mainly from Cs133 by neutron capture. We have successfully produced CsI powder containing no more than 2 mBq/kg of Cs137 by using only ultra-pure water for whole extraction process from raw ore (pollucite).
|Number of pages||7|
|Journal||Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|
|Publication status||Published - 2005 Nov 1|
Bibliographical noteFunding Information:
This work is supported by Korean Ministry of Science and Technology under a Creative Science Initiative Research Program of KOSEF, and partially supported by the Korea Research Foundation Grant (KRF-2002-070-C00027). Authors would like to appreciate the staffs at the Special Metals Division of Chemetall GmbH. Specially, the kind collaborative work by late Dr. Horst Prinz was essential to achieve the reduction of . The authors are very grateful to the Korea Midland Power Co. and their staffs for providing the underground laboratory space at Yangyang.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics