Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Crystal growth and scintillation properties of CsI:Na

CsI:Na 결정 육성과 섬광 특성

  • Cheon, Jong-Kyu (Department of Radiation, Sorabol College) ;
  • Kim, Sung-Hwan (Department of Radiological Science, Cheongju University) ;
  • Kim, H.J. (School of Physics and Energy Sciences, Kyungpook National University)
  • Received : 2010.09.03
  • Accepted : 2010.10.25
  • Published : 2010.11.30
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Abstract

In this work, the scintillation properties of CsI:Na crystal were investigated as radiation detection sensor. This scintillation material was grown by a 2-zone vertical Bridgman method. Under X-ray excitation the crystal shows a broad emission band between 280 nm and 690 nm wavelength range, peaking at 413 nm. Energy resolution for $^{137}Cs$ 662 keV $\gamma$-rays of the crystal was measured to be 6.9 %(FWHM). At room temperature, the crystal exhibits three exponential decay time components. The fast and major component of scintillation time profile of the crystal emission decays with a 457 ns time constant. Absolute light yield of the crystal was estimated to be 53,000 ph/MeV using LAAPD. The sample crystal shows proportionality of 30 % in the measured energy range from 31 to 1,333 keV. And the $\alpha/\beta$ ratio of the crystal was 0.14.

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