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Nd2O3 를 첨가한 Gadolinium-Borate 유리 섬광체의 발광특성 연구
하대훈,김홍주,박정민,J. Kaewhao 한국물리학회 2015 새물리 Vol.65 No.3
Glass scintillators have good radiation hardness and high chemical and thermal resistance. Therefore, glass scintillators are suitable for use in the high-energy physics, nuclear power, and so on. Because the fabrication of glass scintillators is not difficult, adding various dopants is easy. Thus, we doped rare-earth elements in glass scintillators in order to increase their luminescence properties. In this study, we used Nd2O3-doped glass scintillators with a formula of (55-x)B2O3:25Gd2O3:10SiO2:10CaO:xNd2O3 (x: 0.05 2.50 mol%). We measured the absorption spectrum, the X-ray-induced emission spectrum, and the photoluminescence of Nd2O3-doped gadolinium-borate glass scintillators. The absorption spectrum followed the f-f transition of Nd3+ ions. In the X-ray-induced emission spectrum, an emission peak was observed at 890 nm. The photon emission peaks are 800 nm and 890 nm, and excitation peaks are 542 nm, 592 nm and 653 nm. 유리 섬광체는 방사선에 대한 저항도가 높고 화학적, 열적 내성이 높아 고에너지 물리 및 원자력분야 등에서 쓰이기에 적합하다. 유리 섬광체는 제작 방법이 간편하여 다양한 원소를 첨가하기가 편하므로, 란탄족 원소이온을 이용하여 섬광 특성을 개선하기에 용이하다. 본 연구에서 Nd2O3가 첨가된 Gadolinium-Borate 유리 섬광체를 사용하였으며, 실험에 사용된 유리 섬광체는 (55-x)B2O3:25Gd2O3:10SiO2:10CaO:xNd2O3 (Nd2O3 첨가농도: 0.05 ~ 2.50 mol%)의 조성비를 가진다. 섬광체의 흡수 스펙트럼, X-선에 대한 발광 스펙트럼, 광자에 의한 여기 및 방출 스펙트럼을 측정 하였다. 실험 결과, 흡수 스펙트럼은 모두 f-f전이를 따랐으며, X-선에 의한 발광파장은 890 nm로 측정되었다. 광자 여기 스펙트럼은 800 nm, 890 nm 에서 측정되었고, 방출 스펙트럼은 542 nm, 592 nm, 653 nm 임을 확인하였다.
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Luminescence Properties of Dy3+ doped Lanthanum-Calcium-Silicaborate Glass Scintillator
박정민,하대훈,S.W. Lee,N. Chanthima,Y. Ruangtaweep,J. Kaewkhao 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
In this research Dy3+-doped lanthanum-calcium-silicaborate glass scintillators, with the formula 25La2O3 : 10CaO : 10SiO2 : (55-x)B2O3 : xDy2O3, were fabricated by using the melt-quenching technique. For the Dy3+ doping concentrations from 0.05 mol% to 0.5 mol% studied the luminescence properties of the Dy3+-doped glass scintillators with various radiation sources, such as X-ray, photo-, laser, and proton. To understand the absorption state, we measured the transmittance spectrum. Furthermore, X-ray, photo- and proton-induced emission spectra were measured to study the transition states of Dy3+-doped glass scintillators. The laser-induced emission spectra were measured at low temperatures in the range from 10 K to 300 K.
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Sujita Karki,Pabitra Aryal,하대훈,김홍주,박향규,Indra Raj Pandey 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.7
Nano powders of CaMoO$_4$ were synthesized by using the precipitation method, and the obtained powders were dried inside a vacuum oven at 120 $^\circ$C. The phases of powders were analyzed by using X-ray diffraction (XRD), which revealed that CaMoO$_4$ was free from any extra phases. The surface morphologies of the powders were studied by using transmission electron microscopy (TEM), and the average particle sizes were quite small, being in the range of 7 nm. The optical properties were characterized by using ultraviolet-visible (UV-vis) absorption spectroscopy and the optical energy band gap was found to be 5.51 eV. The fluorescence decay time and the luminescence spectrum of the sample were measured under the excitation by Laser (266 nm), X-ray and proton sources. The obtained results were compared with the CaMoO$_4$ bulk crystal and sintered powder obtained from the solid state reaction.
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LYSO 단결정의 양성자에 대한 발광 응답 측정 및 Birks 매개변수 결정
강상준,김민정,박정민,이주영,손주경,하대훈,황용석 한국물리학회 2016 새물리 Vol.66 No.6
We investigated the scintillation characteristics, including the energy resolution and pulse height spectrum, of a LYSO (Lu$_{2(1-x)}$Y$_{2x}$SiO$_5$) crystal by using a 661 keV $\gamma$-ray source and proton beams of various energies. The luminescence response of the LYSO crystal to the energy of the proton beam was measured for proton beam energies in the range from 39 MeV to 100 MeV by using the 100 MeV proton beam of the Korea Multi-Purpose Proton Accelerator Complex (KOMAC) with different thicknesses of aluminum degraders, and we detected the proton luminescence spectrum of the LYSO crystal. For the determination of the energy of the proton beam incident on the crystal after it had passed through the degraders and 160 cm of air, we used the SRIM code based on the Monte Carlo simulation. We fitted the parameters of the generalized semi-empirical Birks formula by using the experimental data and the SRIM simulation. 본 연구에서는 LYSO (Lu$_{2(1-x)}$Y$_{2x}$SiO$_5$) 섬광단결정에 방사능 원천 $^{137}$Cs의 662 keV 감마선을 조사하여, 파고스펙트럼과 에너지 분해능 등 섬광 특성을 측정하였다. 경주 양성자 가속기 연구센터 (Korea Multi-Purpose Proton Accelerator Complex (KOMAC))의 100 MeV 양성자빔과 여러가지 두께의 알루미늄 디그레이더를 이용하여 39 MeV에서 100 MeV 사이의 에너지를 가지는 양성자 빔을 LYSO 섬광단결정에 조사하여, 양성자에 대한 LYSO 단결정의 발광 응답을 측정하였다. 이 때 양성자빔이 160 cm의 공기와 알루미늄 디그레이더를 통과한 후 표적 셈플에 도달했을 때의 양성자의 에너지와, LYSO 섬광단결정 내에서 양성자가 잃는 에너지와 양성자 경로의 길이는 SRIM 툴킷을 이용한 시뮬레이션을 이용하여 구하였다. 실험 데이터와 시뮬레이션 데이터를 이용하여 Birks의 반-경험 공식의 매개변수를 추정하였다.
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K. Kirdsiri,J. Kaewkhao,박정민,하대훈 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
Lutetium (Lu) is a high atomic number material and readily interacts with X-rays, which makes it a good scintillation material. In this work, Lu-glass scintillators from the series xSm2O3 : 25Lu2 O3 : 10SiO2 : 10CaO : (55-x)B2O3 (LuCSB) were synthesized at 1500 ◦ C by using a simple melt quenching technique. The influence of the Sm3+ ion on their physical, optical, photo-, X-rayand proton-induced properties has been characterized. The amorphous nature of the samples was confirmed by using X-ray diffraction. The density and the molar volume were found to be increased at higher concentrations of Sm3+. The X-ray- and the proton-induced emission spectra of the Sm3+:LuCSB glasses showed an intense reddish-orange emission around 604 nm (4G5/2 → 6H7/2), which matched the photoluminescence (PL) emission spectrum well. Among the prepared glasses, the 1.0-mol% Sm3+ ion-activated LuCSB glass exhibited the highest value of the characteristic emission parameters. The X-ray-induced luminescence of the LuCSB glass was also compared with that of a commercial bismuth germinate Bi4Ge3O12 (BGO) crystal.
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