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

Journal Article · Thu Sep 08 00:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2060458· OSTI ID:20719252

Kim, Y D; Kang, W G; Lee, H S; Lee, J I; Lee, J Y ^[1]; Hahn, I S; Lee, E K ^[2]; Hwang, M J; Kwon, Y J ^[3]; Jin, Li ^[4]; Kim, H J ^[5]; Kim, S C; Kim, S K; Kim, S Y; Kim, T Y; Kwak, J W; Lee, M J; Myung, S S; Yang, H Y ^[6]; Park, H ^[7]

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1. Department of Physics, Sejong University, Seoul, 143-747 (Korea, Republic of)
2. Department of Science Education, Ewha Woman's University, Seoul 120-750 (Korea, Republic of)
3. Physics Department, Yonsei University, Seoul 120-749 (Korea, Republic of)
4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100039 (China)
5. Physics Department, Kyungpook National University, Daegu, 702-701 (Korea, Republic of)
6. School of Physics, Seoul National University, Seoul, 151-742 (Korea, Republic of) and DMRC, Seoul National University, Seoul, 151-742 (Korea, Republic of)
7. Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science, Yuseong, Daejeon, 305-600 (Korea, Republic of); and others

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)

• OSTI ID: 20719252
• Journal Information: AIP Conference Proceedings, Vol. 785, Issue 1; Conference: LRT 2004: Topical workshop on low radioactivity techniques, Sudbury, ON (Canada), 12-14 Dec 2004; Other Information: DOI: 10.1063/1.2060458; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CAPTURE
CESIUM 133
CESIUM 134
CESIUM 137
CESIUM IODIDES
CONTAMINATION
CRYSTALS
EXTRACTION
HIGH-PURITY GE DETECTORS
NEUTRON REACTIONS
POLLUCITE
POWDERS
RADIOACTIVITY
WATER