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

Journal Article · Mon Aug 17 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4927984· OSTI ID:22488701

Lee, Hyun Su ^[1]

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1. Department of Physics, Ewha Womans University, Seoul 120-750 (Korea, Republic of)

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.

• OSTI ID: 22488701
• Journal Information: AIP Conference Proceedings, Vol. 1672, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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