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LiF ( Mg , Cu , Na , Si ) 형광체의 열자극엑소전자 방출
도시홍,정중현,청본정의 (靑本正義),서천사웅 (西川嗣雄),옥천양일 (玉川洋一),기부광효 (磯部光孝) ( Sih Hong Doh,Jung Hyun Jeong,M . Aoki,T . Nishikawa,Y . Tamagawa,M . Isobe ) 한국센서학회 1994 센서학회지 Vol.3 No.2
The TSEE characteristics of LiF(Mg,Cu,Na,Si)phosphor for gamma and beta rays are described. The TSEE glow curve of this phosphor showed 5 peaks in the range from 20 ℃ to 400 ℃; and its main peak appeared at 240℃. The sensitivity of the phospor for ^(60)Co gamma rays was about 450counts/mR. TSEE energy dependence for various beta radiation was nearly constant (±10%) in the mean beta particle energy range from 0.02MeV to 0.8MeV. The efficiency of TSEE of the phosphor for beta radiation was (2∼15)x10^(-3).
LiF:Mg,Cu,P TLD 의 잠상퇴행과 열처리 특성
도시홍,이우교,유명진,강희동,김도성 ( Sih Hong Doh,Woo Gyo Lee,Myung Jin Yoo,Hee Dong kang ) 한국센서학회 1998 센서학회지 Vol.7 No.5
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 100 ℃. The thermal annealing characteristics is examined in the temperature range from 260 ℃ to 320 ℃. For annealing the TLD at 280 ℃ for 10 minutes, TLDs can be reusable by recovering the initial sensitivity.
LiF ( Mg , Cu , Na , Si ) 열형광선량계에 의한 베타선량 측정
도시홍,박희대,김도성,강희동 ( Sih Hong Doh,Hee Dae Park,Do Sung Kim,Hee Dong kang ) 한국센서학회 1993 센서학회지 Vol.2 No.2
LiF(Mg, Cu, Na, Si)TLD was prepared by sintering LiF doped with Mg, Cu, Na, and Si, and an extrapolation ionization chamber was fabricated to measure the absorbed dose of β rays. The detection efficiency, individual dose equivalent(superficial)Hy(0.07), depth-dose curve, and energy compensation filter were investigated in the range from 200 keV tcn 2:279 MeV of β ray energies. The TL response was also tested as a function of the grain size in the range of 44∼250 ㎛.
구형 BGO 섬광 검출기에 대한 감마선 에너지 스텍트럼 계산
도시홍,김종일,박흥기,추민절,정중현,김기동,이대원 ( Sih Hong Doh,Hung Ki Park,Jong Il Kim,Min Cheal Chu,Jung Hyun Jeong,Gi Dong Kim,Dae Won Lee ) 한국센서학회 1995 센서학회지 Vol.4 No.4
The γ-ray deposition spectra were calculated by Monte Calro method to obtain the scintillation characteristics of the γ-ray for BGO scintillation detector with the spherical shape of 1.25 cm radius. The code used in calculating the γ-ray deposition spectra was made for personal computer with qbasic language. Also the γ-ray energy spectra of ^(22)Na, ^(137)Cs and ^(207)Bi were measured with the detector. The energy dependent resolution below 2000 keV for the detector was determined by estimating the standard deviation of the photopeak fitted with gaussian function, and x² fitting using Nardi`s empirical formula. The measured spectra of ^(22)Na and ^(137)Cs were compared with the broadened spectra which were obtained by broadening the calculated γ-ray deposition spectra with the energy dependent resolution. The absolute efficiency and the intrinsic peak efficiency of the detector were obtained by calculating the γ-ray deposition spectrum with the code.
김종일,정중현,도시홍,황해선,김성철,김중환 ( Jong Il Kim,Jung Hyun Jeong,Sih Hong Doh,Hae Sun Hwang,Sung Chuel Kim,Jung Hwan Kim ) 한국센서학회 1997 센서학회지 Vol.6 No.1
Bismuth germanate crystals well known as scintillator were grown by Czochralski method. In order to understand a mechanism of radiation resistance in Eu-doped BGO, we measured radiation induced-absorption spectra, excitation spectra, emission spectra and luminescence lifetimes of BGO crystals. We found that the charge transfer state of Eu^(3+) ion is to play a key role to enhance the radiation resistance in BGO crystal. The ^5D_0 emission of Eu^(3+) ions that is not suitable for the radiation detectors due to a long decay time was found to be increased with increasing europium concentration. In the BGO crystal doped with 0.1 mole%, the density of radiation induced color centers was reduced about twenty times and the light output of ^5D_0 was negligible by comparing to that of BGO.
SrCl<sub>2</sub>:Eu<sup>2+</sup>,Na<sup>+</sup> X-선 영상저장 형광체의 발광특성
김성환,김완,강희동,도시홍,서효진,김영국,김도성,Kim, Sung-Hwan,Kim, Wan,Kang, Hee-Dong,Doh, Sih-Hong,Seo, Hyo-Jin,Kim, Young-Kook,Kim, Do-Sung 한국재료학회 2003 한국재료학회지 Vol.13 No.6
Photoluminescence(PL), photostimulated luminescence(PSL) and thermoluminescence(TL) in $SrC1_2$:$Eu^{2+}$ , $Na^{+}$ phosphor powder were measured, and the activation energies(trap depth) of traps associated with TL and PSL were investigated. The PL and PSL in the studied sample is due to the $4f^{6}$ 5d\longrightarrow$4f^{7}$transition of $Eu^{ 2+}$. TL glow curve is single peak, and its peak temperature is about 377.2 K. The PL, PSL and TL emission spectra of the phosphors are located in the range of 380∼440 nm, peaking at 408 nm. The activation energy of the PSL trapping center is 0.78 eV and that of the TL trapping center is 0.79 eV. We, thus, suggest that the trapping centers giving rise to the PSL are identical to those giving rise to the TL.