CsI:Na 결정 육성과 섬광 특성
Crystal growth and scintillation properties of CsI:Na
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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 ﾠnm and 690 ﾠnm wavelength range, peaking at 413 ﾠnm. Energy resolution for 137Cs 662 ﾠkeV γ-rays of the crystal was measured to be 6.9 ﾠ%(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 ﾠph/MeV using LAAPD. The sample crystal shows proportionality of 30 ﾠ% in the measured energy range from 31 to 1,333 ﾠkeV. And the α/β ratio of the crystal was 0.14.
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 ﾠnm and 690 ﾠnm wavelength range, peaking at 413 ﾠnm. Energy resolution for 137Cs 662 ﾠkeV γ-rays of the crystal was measured to be 6.9 ﾠ%(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 ﾠph/MeV using LAAPD. The sample crystal shows proportionality of 30 ﾠ% in the measured energy range from 31 to 1,333 ﾠkeV. And the α/β ratio of the crystal was 0.14.
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