Study of the internal background of CsI(Tℓ) crystal detectors for dark matter search

T. Y. Kim, I. S. Cho, D. H. Choi, J. M. Choi, I. S. Hahn, M. J. Hwang, H. K. Jang, R. K. Jain, U. K. Kang, H. J. Kim, J. H. Kim, S. C. Kim, S. K. Kim, S. Y. Kim, Y. D. Kim, Y. J. Kwon, H. S. Lee, J. H. Lee, M. H. Lee, S. E. LeeS. H. Noh, H. Park, I. H. Park, E. S. Seo, E. Won, H. S. Won, H. Y. Yang, M. S. Yang, I. Yu

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


A search for particle cold dark matter with CsI(Tℓ) crystal is being prepared at the Cheong-Pyeong underground laboratory in Korea. The background spectra of CsI(Tℓ) crystal detectors in a prototype shield were obtained. The lowest background count rate of the test sample of crystals is measured to be 64.7±5.1 counts/keV/kg/day in the energy range of 5-20 keV. Quantitative estimation of residual radioactive isotope in CsI(Tℓ) was made using the GEANT4 Monte Carlo simulation. Analysis results show that CsI(Tℓ) crystal could be a good candidate for direct detection of WIMPs when the contamination level of cesium radioisotopes is reduced to under a few mBq/kg.

Original languageEnglish
Pages (from-to)337-344
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
Publication statusPublished - 2003 Nov 3
Externally publishedYes

Bibliographical note

Funding Information:
This work is supported by the Korean Ministry of Science and Technology under a Creative Research Initiatives Program. We are very grateful to the staff in the underground pumped storage power plant of the Korea Electric Co. at Cheong-Pyeong, who kindly provided space for us to use the laboratory.


  • CsI(Tℓ) crystal
  • Dark matter
  • Decay
  • WIMP

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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