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Title: Development of low background CsI(Tl) and NaI(Tl) crystals for WIMP search

We have developed low background CsI(Tl) and NaI(Tl) crystals to search for weakly interacting massive particles as well as to verify the origin of the annual modulation signal observed by the DAMA/LIBRA experiment. Extensive studies about the contamination mechanisim of {sup 137}Cs in CsI powder lead to the growth of ultra-low-background CsI(Tl) crystals. Similar approaches for NaI(Tl) crystals have been applied to reduce internal backgrounds to less than 0.5 counts/kg/day/keV. Status and understanding of backgrounds and background reduction in NaI(Tl) crystals will be discussed.
Authors:
 [1]
  1. Department of Physics, Ewha Womans University, Seoul 120-750 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22488701
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1672; Journal Issue: 1; Conference: LRT 2015: 5. international workshop in low radioactivity techniques, Seattle, WA (United States), 18-20 Mar 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BACKGROUND RADIATION; CESIUM 137; CESIUM IODIDES; CRYSTAL GROWTH; CRYSTALS; KEV RANGE; MODULATION; NAI DETECTORS; POWDERS; SIGNALS; SODIUM IODIDES; WIMPS