Sih-Hong Doh

Pukyong National University, Tsau-liang-hai, Busan, South Korea

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Publications (18)13.31 Total impact

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    ABSTRACT: We present the luminescent and scintillation characteristics of CsI:CO<sub>3</sub> single crystals. The CsI:CO<sub>3</sub> single crystals were grown by using Czochralski method for different concentrations of CO<sub>3</sub> from 0.007 to 0.1 mole%. The crystals were cut into a size of 10 mm times 10 mm times 5 mm. The luminescent characteristics were measured with X-rays to study the emission spectra of the CsI:CO<sub>3</sub> crystals. The scintillation properties of the CsI:CO<sub>3</sub> crystals such as fluorescence decay time, energy resolution, pulse height spectra, proportionality, and relative light output were studied by using various gamma-ray sources with a photomultiplier tube (PMT) at room temperature. The absolute light outputs of the crystals were also measured with an avalanche photo-diode (APD).
    IEEE Transactions on Nuclear Science 07/2009; · 1.22 Impact Factor
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    ABSTRACT: In this paper, crystal growth and scintillation properties of Rb<sub>2</sub>CeBr<sub>5</sub> crystal are presented. The crystal was grown with the Bridgman method using a two zone transparent furnace. The investigation of scintillation properties of the crystal were performed under the excitation by X-ray and gamma;-ray at room temperature. The emission spectrum of the Rb<sub>2</sub>CeBr<sub>5</sub> was observed in the range of 360 ~ 440 nm, peaking at 390.5 nm, which is due to the 5d rarr 4f transitions of the Ce<sup>3+</sup>. The decay time of the Ce<sup>3+</sup> emission was composed two components. The fast component was 56.1 ns (98.8%), and the slow component was 329.9 ns (1.2%). The energy resolution of the crystal was obtained to be 6.9% for the <sup>137</sup>Cs 662 keV gamma-ray. The absolute light yield of the Rb<sub>2</sub>CeBr<sub>5</sub> crystal is about 34,000 phs/MeV, and the non-proportionality of the crystal was also measured.
    IEEE Transactions on Nuclear Science 07/2009; · 1.22 Impact Factor
  • Journal- Korean Physical Society 01/2009; 54(52). · 0.51 Impact Factor
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    ABSTRACT: We report on a new scintillation crystal, CsCe2Cl7, for γ-ray spectroscopy. The crystal was grown using the Czocralski pulling method. X-ray excited luminescence measurements of the CsCe2Cl7 showed a broad emission band in the wavelength range from 370 to 470 nm with a peak centre at 410 nm. An energy resolution (FWHM of peak position) for the 662 keV full energy peak of 5.5% was observed at room temperature. The results showed a good proportionality for light output versus γ-ray energy. The light output deviation from the linear response is about 10% between the energy range of 31 and 1333 keV. We measured a light yield of 28,000 photons/MeV of absorbed γ-ray energy. The scintillation decay curve of CsCe2Cl7 can be described by a single exponential decay function with a decay time of 50 ns. Overall, these measurements clearly indicate that CsCe2Cl7 can exhibit attracting scintillation properties, and we believe that the CsCe2Cl7 crystal is a promising material for medical imaging and radiation detection.
    Journal of Crystal Growth 12/2008; 311(1):128-131. · 1.55 Impact Factor
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    ABSTRACT: Crystal growth, luminescence, and scintillation properties of a CeBr<sub>3</sub> crystal are presented. The crystal was grown with Bridgman method using two-zone transparent furnace and cut to Oslash10 times 10 mm<sup>3</sup>. The investigation of luminescence and scintillation properties of the CeBr<sub>3</sub> was performed under the excitation by ultraviolet and gamma-rays at room temperature. The emission spectrum of the CeBr<sub>3</sub> was observed in the range of near ultraviolet to violet, which is due to the 5d rarr 4f transition of Ce<sup>3+</sup>. The decay time of the Ce<sup>3+</sup> emission was measured to be approximately 20 ns. The energy resolution of the CeBr<sub>3</sub> single crystal was obtained to be 4.9% for the <sup>137</sup>Cs 662 keV gamma-rays. The relative signal of the CeBr<sub>3</sub> crystal by the <sup>137</sup>Cs gamma-rays is about three times higher than that of a CsI:Tl crystal when a bi-alkali PMT was used. The nonproportionality in the gamma-ray energy of the crystal was also measured. The study showed that the CeBr<sub>3</sub> crystal is the promising candidate for the PET application. The CeBr<sub>3</sub> crystal with high light output and fast decay time affords its use for the particle detection in a high counting rate environment such as nuclear and high-energy physics.
    IEEE Transactions on Nuclear Science 07/2008; · 1.22 Impact Factor
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    ABSTRACT: In this paper, we present scintillation properties of the new developed single crystals of Ba<sub>x</sub>Sr<sub>1-x</sub>Cl<sub>2</sub> for different concentration of x. We manufactured Ba<sub>0.12</sub>Sr<sub>0.88</sub>Cl<sub>2</sub>, Ba<sub>0.20</sub>Sr<sub>0.80</sub>Cl<sub>2</sub>, Ba<sub>0.22</sub>Sr<sub>0.78</sub>Cl<sub>2</sub> crystals, and CsI(Tl) crystal as reference by using the Czochralski method. The crystals were cut into a size of 5 times 10 times 10 mm<sup>3</sup>. The X-ray diffraction technique was used to verify the structure of crystals. The emission spectra were measured with X-ray excitation at room temperature. Scintillation properties of the crystals such as pulse height spectra, energy resolution, alpha/beta ratio, relative light output, proportionality, and fluorescence decay time were measured with the various radioactive gamma sources at room temperature. The light output of these crystals were compared with that of the CsI(Tl) crystal. The differences in relative light outputs, energy resolutions, and decay times among these crystals were studied in detail.
    IEEE Transactions on Nuclear Science 07/2008; · 1.22 Impact Factor
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    ABSTRACT: The concentrations of naturally occurring radioisotopes ((232)Th, (228)Th, (230)Th, (228)Ra, (226)Ra, and (40)K) in typical Korean foods were evaluated. The daily intakes of these radioisotopes were calculated by comparing concentrations in typical Korean foods and the daily consumption rates of these foods. Daily intakes were as follows: (232)Th, 0.00-0.23; (228)Th, 0.00-2.04; (230)Th, 0.00-0.26; (228)Ra, 0.02-2.73; (226)Ra, 0.01-4.37 mBq/day; and (40)K, 0.01-5.71 Bq/day. The total daily intake of the naturally occurring radioisotopes measured in this study from food was 39.46 Bq/day. The total annual internal dose resulting from ingestion of radioisotopes in food was 109.83 muSv/y, and the radioisotope with the highest daily intake was (40)K. These values were same level compiled in other countries.
    Journal of Environmental Radioactivity 02/2008; 99(8):1319-23. · 2.12 Impact Factor
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    Gul Rooh, Heedong Kang, H. J. Kim, Sih-Hong Doh
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    ABSTRACT: The aim of this study is to develop scintillation crystals for the study of neutrinoless beta<sup>+</sup>/EC decay process. The <sup>84</sup>Sr isotope is one of the potential candidates for the neutrinoless beta<sup>+</sup>/EC decay process. None of the scintillation crystals containing a strontium element up till now were used for the study of neutrinoless beta<sup>+</sup>/EC decay process. In general our crystal growth program include studies of starting material preparation, growth procedures and characterization of grown crystals. We grew a SrCl<sub>2</sub> single crystal by using the Czochralski method. The cylindrical shape of the SrCl<sub>2</sub> crystal was cut into the dimensions of Oslash2 times 1.5 cm<sup>3</sup>. The scintillation properties were studied by using various gamma ray sources and an alpha source. The scintillation properties such as energy resolution, light output, linearity and decay time were presented. In particular, the alpha/beta light ratio and possibility of a pulse shape discrimination between alpha and gamma quanta using a <sup>210</sup>Po alpha source were studied.
    IEEE Transactions on Nuclear Science 01/2008; 55:1445-1448. · 1.22 Impact Factor
  • Journal- Korean Physical Society 01/2008; 52(93). · 0.51 Impact Factor
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    ABSTRACT: crystal was grown using Czochralski method from equimolar mixture of CsCl and . The spectrum range of the luminescence excited by 205 nm of wavelength was about nm, and its peak emission appeared at 343 nm. The luminescence decay curve of the revealed two exponential components with time constants of 60 ns and 700 ns. The energy resolution for 662 keV -ray was 10.3 %. The pulse shape was linear at high energy, but some deviation existed in the low energy region.?? 會? ―中? ??? ????? 會? 정中? ??? ????? 會? ?中? ??? ?????? 會? ?中? 碎?? ?????? 會? 쀗中? ??? ?????? 會? ?中? 좌?? ?????? 會? ?中? ??? ??????
    Journal of Sensor Science and Technology. 01/2007; 16(5).
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    ABSTRACT: The 239+240Pu content of the marine sediments and seawater of the costal sea of Korea was measured. In marine sediments the 239+240Pu concentrations were in the range of 0.11-1.91 Bq/kg dry weight and in the coastal sea of Korea the ratio of 239+240Pu/137Cs was 0.27. The correlations between 239+240Pu and 137Cs concentrations and the content of organic matter (C, O, H, N, S) as well as the grain size of marine sediment were investigated by regression analysis. The distribution coefficient of 239+240Pu was 1.22. 105. The 239+240Pu concentration in seawater increased with seawater depth. However, the 137Cs concentration in seawater did not change considerably with depth.
    Journal of Radioanalytical and Nuclear Chemistry 03/2006; 268(1):103-108. · 1.47 Impact Factor
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    ABSTRACT: The organically bound tritium(OBT) concentrations of the marine organisms(seaweed and shellfish) around Wolsung nuclear power plants were measured. The OBT concentrations of seaweeds were in the range of Bq/kg-fresh. The OBT concentrations of shellfish were in the range of Bq/kg-fresh. The internal dose due to the OBT concentration of seaweed was estimated as mSv/year.
    Journal of Radiation Protection. 01/2003; 28(1).
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    ABSTRACT: The photoluminescence (PL) and photostimulated luminescence (PSL) properties of SrCl2:Eu2+ and SrCl2:Eu2+:Na+ are investigated. A strong PSL emission is observed for SrCl2:Eu2+ and its intensity is enhanced by codoping with Na+ ions. The mechanisms of PL and PSL are discussed in relation to the formation of F centers in SrCl2:Eu2+ and SrCl2:Eu2+:Na+.
    Japanese Journal of Applied Physics 01/2003; 42:4390-4391. · 1.07 Impact Factor
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    ABSTRACT: CsI single crystals doped with lithium, potassium or rubidium were grown by using Czochralski method at Ar gas atmosphere. The energy resolutions of CsI(Li:0.2 mole%), CsI(K:0.5 mole%) and CsI(Rb:1.5 mole%) scintillators were 14.5%, 15.9% and 17.0% for (0.662 MeV), respectively. The energy calibration curves of CsI(Li), CsI(K) and CsI(Rb) scintillators were linear for -ray energy. The time resolutions of CsI(Li:0.2 mole%), CsI(K:0.5 mole%) and CsI(Rb:1.5 mole%) scintillators measured by CFT(constant-fraction timing method) were 9.0 ns, 14.7 ns and 9.7 ns, respectively. The fluorescence decay times of CsI(Li:0.2 mole%) scintillator had a fast component and slow one of and , respectively. The fluorescence decay times of CsI(K:0.5 mole%) scintillator were and . And the fluorescence decay times of CsI(Rb:1.5 mole%) scintillator were and . The phosphorescence decay times of CsI(Li:0.2 mole%), CsI(K:0.5 mole%) and CsI(Rb:1.5 mole%) scintillators were 0.51 s, 0.57 s and 0.56 s, respectively.
    Journal of Sensor Science and Technology. 01/2003; 12(1).
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    ABSTRACT: BaFBr: phosphors were prepared, and the thermoluminescence(TL) and photostimulated luminescence(PSL) of the prepared phosphors were measured. Two glow peaks around 352 and 448 K are observed for x-ray irradiated BaFBr: phosphors, and the activation energy of the main glow peak(352 K) was about 0.96 eV. The spectral range of the PSL was , and the activation energy of the trap giving rise to PSL was about 0.98 eV. The activation energy of the traps giving rise to TL is agreed to those giving rise to PSL within experimental error.
    Journal of Sensor Science and Technology. 01/2002; 11(5).
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    ABSTRACT: phosphors were prepared by the solid phase reaction method, and their photostimulated luminescence(PSL) and photoluminescence(PL) characteristics were investigated. The PSL and PL peak of the phosphors are due to the transition of ions in phosphors. The PSL and PL spectrum obtained by the 355nm excitation was observed in region with the peak at 407 nm. The dose response of the PSL phosphors were linear within of 100 kV X-ray. The fading of the phosphors at room temperature was approximately 60% after 20 min.
    Journal of Sensor Science and Technology. 01/2002; 11(6).
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    ABSTRACT: The thermal annealing, reusability and fading characteristics of the highly sensitive LiF:Mg,Cu,P TLDs are investigated. Thermoluminescent sensitivity of the fabricated LiF:Mg,Cu,P TLD is 25.3 times higher than the commercial dosimeter TLD-700(Harshaw Chemical Co.). The main dosimetric peak shows no fading for 1 month at room temperature and 50% for 7 days at . The thermal annealing characteristics is examined in the temperature range from to . For annealing the TLD at for 10 minutes, TLDs can be reusable by recovering the initial sensitivity.
    Journal of Sensor Science and Technology. 01/1998; 7(5).
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    ABSTRACT: In order to evaluate past levels of 3H and radiocarbon in the environment near the Wolsung Nuclear Power Plant (NPP), Korea, pine trees were sampled at 3 locations within 1 km of the Wolsung site in 2002, and their concentrations of 3H and 14C were analyzed. The α-cellulose was extracted from pine tree rings using the common chlorite method with a subsequent treatment. The concentrations of 3H and 14C were measured by a liquid scintillation (LS) counter. Both organically bound tritium (OBT) and 14C concentrations gradually increased after the commercial operation of the Wolsung NPP, reached a maximum, and then recently decreased. The OBT concentrations of pine tree rings ranged from 34.9 to 393 Bq/L. The OBT concentrations and the gaseous 3H discharge rate were linearly related, and their linear dependence changed with sampling directions and improved by considering the effect of the meteorological conditions, i.e. wind patterns. The 14C concentration of pine tree rings ranged from 0.272 to 1.70 Bq/g C. The concentrations of OBT and 14C in pine tree rings were linearly related, and their linear dependence also changed with sampling directions, which might be explained by the different diffu- sion mechanism of 3H and 14C with distance from the stack. By using the linear dependence of concentrations of OBT and 14C and the gaseous 3H discharge rate, the gaseous 14C discharge rate in the past could be estimated.

Publication Stats

29 Citations
13.31 Total Impact Points

Institutions

  • 2008
    • Pukyong National University
      • Department of Physics
      Tsau-liang-hai, Busan, South Korea
    • Kyungpook National University
      • Department of Physics
      Sangju, North Gyeongsang, South Korea
  • 2006
    • Pusan National University
      • Department of Physics
      Tsau-liang-hai, Busan, South Korea