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RISS 인기검색어
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- 저자 : 천종규(Jong Kyu Cheon) (검색결과 7 건)
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X-선 저장 BaFBr<sub>1-x</sub>I<sub>x</sub>:Eu<sup>2+</sup>, Na<sup>+</sup> 형광체의 제조 및 특성
천종규,김성환,김찬중,김완,강희동,김도성,서효진,도시홍,Cheon, Jong-Kyu,Kim, Sung-Hwan,Kim, Chan-Jung,Kim, Wan,Kang, Hee-Dong,Kim, Do-Sung,Seo, Hyo-Jin,Doh, Sih-Hong 한국센서학회 2002 센서학회지 Vol.11 No.1
The forming conditions of X-ray storage phosrhors $BaFBr_{1-x}I_x:Eu^{2+}$, $Na^+$ have been investigated, and measured the PSL emission spectra and its intensity, fading characteristics and does dependence of the prepared phosphors. These characteristics were compared with those of commercial image plate (ST-III) obtained from Fuji Photo Film Co. The optimal preparing conditions of $BaFBr_{1-x}I_x:Eu^{2+}$, $Na^+$ Phosphor were 0.5 mol% of $EuF_3$, 4.0 mol% of NaF and composition ratio x=0.3, and the sintering temperature were $950^{\circ}C$ in $H_2$ atmosphere. When the composition ratio x was equal to 0, the spectral range of the luminescence of $BaFBr_{1-x}I_x:Eu^{2+}$, $Na^+$ phosphor was $365{\sim}420\;nm$, and its maximum luminescence intensity appeared at 390 nm. When composition ratio x was not equal to 0, the wavelength ranges and peak of the spectra were shifted to the longer wavelength with the growth of composition ratio x. A good linearity was shown between the PSL intensity and X-ray irradiation dose. The phosphor sample with x=0.3 exhibited better fading characteristics than that of other $BaFBr_{1-x}I_x:Eu^{2+}$ phosphor samples, and the fading characteristics of the PSL intensity at room temperature were shown poorer with increasing $I^-$ ion concentration. The lattice constant of the phosphor becomes larger with increasing the $I^-$ ion concentration. X-선 저장 형광체 $BaFBr_{1-x}I_x:Eu^{2+}$, $Na^+$의 조성 조건을 조사하고, 제조한 형광체의 광자극발광 강도, 스펙트럼, fading 특성 및 선량의존성을 조사하였다. 그리고 이 특성을 상업적으로 시판하고 있는 일본 부사(富士)사진필름회사 제품 영상판(ST-III)의 특성과 비교하였다. $BaFBr_{1-x}I_x:Eu^{2+}$, $Na^+$ 형광체의 최적 제조 조건은 $Eu_F3$ 0.5mol%, NaF 4.0mol% 그리고 조성비 x=0.3 이었으며, 소결온도는 수소 분위기에서 $950^{\circ}C$이었다. 조성비 x=0일 때 $BaFBr_{1-x}I_x:Eu^{2+}$, $Na^+$ 형광체의 스펙트럼영역은 $365{\sim}420\;nm$이었고, 최대 발광강도는 390 nm 이었다. $x{\neq}0$일 때 스펙트럼의 파장영역과 피이크 파장은 조성비 x가 증가할수록 장파장쪽으로 이동하였다. X-선 조사선량과 PSL 강도 사이에는 좋은 직선성을 나타내었다. 형광체의 fading 특성은 x=0.3일 때 가장 좋았으며, $I^-$ 이온의 농도가 증가할수록 저하되는 경향을 나타내었다. 또한 $BaFBr_{1-x}I_x:Eu^{2+}$ 격자상수는$I^-$이온의 농도가 증가할수록 커졌다.
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천종규 ( Jong Kyu Cheon ),김성환 ( Sung Hwan Kim ),김홍주 ( Hong Joo Kim ) 한국센서학회 2012 센서학회지 Vol.21 No.4
CsI:Gd crystal was grown by the Bridgeman method and its scintillation properties were investigated. The wavelength peak of the luminescence spectrum for the crystal excited by X-ray was 419 nm. The range of the spectrum was from 300 nm to 800 nm. The spectrum well matched to the quantum efficiency of a typical bi-alkali photo-multiplier tube(PMT). An energy resolution of 48.2 % was obtained for 662 keV γ-rays of 137Cs. The three decay times were obtained as a fast(557.4 ns, 42.2 %), intermediate (1.78 μs, 29.7 %) and slow (5.43 μs, 28.1 %) components, respectively.
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천종규 ( Jong Kyu Cheon ),김성환 ( Sung Hwan Kim ),김홍주 ( H J Kim ) 한국센서학회 2010 센서학회지 Vol.19 No.6
In this work, the scintillation properties of Csl: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 137Cs 662 keV y-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 a/β~ ratio of the crystal was 0.14.
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조직 등가 섬광체를 이용한 계수형 선량계의 개발과 특성 평가
천종규 ( Jong Kyu Cheon ),김성환 ( Sung Hwan Kim ),김홍주 ( Hong Joo Kim ) 한국센서학회 2014 센서학회지 Vol.23 No.1
A dosimeter using tissue-equivalent scintillator by photon-counting method was developed and evaluated in its performance. The dosimeter is portable and can be operated by low power from lap-top computer. A data-acquisition software of the dosimeter system was developed by Labwindows/CVI based on Windows. The energy to channel ratio for energy calibration was 0.839 keV/ch. obtained from pulse height spectrum of 137Cs and 60Co gamma-ray. Using the dosimeter system, the absorbed dose of environmental radiation in Gyungju was 0.18 Sv/h.
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단일 보너구와 TLD-600 및 TLD-700을 이용한 Cf-252의 중성자 에너지 스펙트럼 평가
김성환 ( Sung Hwan Kim ),천종규 ( Jong Kyu Cheon ),이재진 ( Jae Jin Lee ),남욱원 ( Uk Won Nam ) 한국센서학회 2013 센서학회지 Vol.22 No.3
We designed a single polyethylene bonner sphere with several thermo-luminescence dosimeters (TLD), for measurement of neutron energy spectrum. For the separation of the neutron dosage in the neutron-gamma mixed field, we used 21 ea TLD-600s and TLD-700s, respectively. Because, TLD-600 is sensitive to neutron and gamma rays, and, TLD-700 is sensitive only to gamma-rays, we could determine the each dose[U1] by neutron and gamma rays. The neutron response function of the bonner sphere with TLDs was calculated by MCNPX (ver. 2.5.0) Monte Carlo simulation in the energy range from 10-1 to 20 MeV. For the Cf-252 standard neutron source in KRISS, we could estimate the neutron energy spectrum by unfolding method using the response function.
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플라스틱 섬광체의 제작과 60Co γ - 선에 의한 방사선 손상
김성환(Sung Hwan Kim),남승희(Seung Hee Nam),천종규(Jong Kyu Cheon),김완(Wan Kim),강희동(Hee Dong Kang),김도성(Do Sung Kim),이우교(Woo Gyo Lee),도시홍(Sih Hong Doh) 한국센서학회 2000 센서학회지 Vol.9 No.5
N/A The optimum composition ratios of primary solute(p-terphenyl) and secondary solute(popop) have been investigated in order to fabricate plastic scintillator with higher light output and less radiation damage. The radiation damage induced by Y -irradiation depends on mainly the concentration of secondary solute. The spectral range of the luminescence was 400∼450 nm, its peak emission appeared at 415 nm. The transmittance and the light output were not changed by radiation damage up to 1 x 10⁴ Gy irradiation with ^(60)Co γ-rays.
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X-선 저장 BaFBr₁- xIx:Eu²+, Na+ 형광체의 제조 및 특성
강희동,김찬중,도시홍,김도성,김완,서효진,천종규,김성환 한국센서학회 2002 센서학회지 Vol.11 No.1
Ihe forming conditions of X-ray storage phosphors BaFBr_(1-x)I_x:Eu^(2+),Na^+ have been investigated, and measured the PSL emission spectra and its intensity, fading characteristics and does dependence of the prepared phosphors. These characteristics were compared with those of commercial image plate (ST-III) obtained from Fuji Photo Film Co. The optimal preparing conditions of BaFBr_(1-x)I_x:Eu^(2+),Na^+ phosphor were 0.5 mol % of EuF₃, 4.0 mol % of NaF and composition ratio x = 0.3, and the sintering temperature were 950 ℃ in H₂ atmosphere. When the composition ratio x was equal to 0, the spectral range of the luminescence of BaFBr_(1-x)I_x:Eu^(2+),Na^+ phosphor was 365 ∼ 420 nm, and its maximum luminescence intensity appeared at 390 nm . When composition ratio x was not equal to 0, the wavelength ranges and peak of the spectra were shifted to the longer wavelength with the growth of composition ratio x. A good linearity was shown between the PSL intensity and X-ray irradiation dose. The phosphor sample with x=0.3 exhibited better fading characteristics than that of other BaFBr_(1-x)I_x:Eu^(2+),Na^+ phosphor samples, and the fading characteristics of the PSL intensity at room temperature were shown poorer with increasing T ion concentration. The lattice constant of the phosphor becomes larger with increasing the I^- ion concentration.
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