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A Study of the Inorganic Scintillator Properties for a Phoswich Detector
Lee, Woo-Gyo,Kim, Yong-Kyun,Kim, Jong-Kyung,Tarasov, V.,Zelenskaya, O. Korean Association for Radiation Protection 2004 방사선방어학회지 Vol.29 No.4
CsI(Tl), $CdWO_4(CWO),\;Bi_4Ge_3O_{12}(BGO)\;and\;Gd_2SiO_5:Ce(GSO)$ scintillators were studied to manufacture a phoswich detector. The maximum wavelengths of the CsI(Tl), CWO, BGO and GSO scintillators are 550 nm, 475 nm, 490 nm and 440 nm for the radioluminescence, and the absolute light outputs of the CsI(Tl), CWO, BGO and GSO scintillators are 54890 phonon/MeV, 17762 phonon/MeV, 8322 phonon/MeV and 8932 phonon/MeV with a neutral filter, and the decay time of the CsI(Tl), CWO, BGO and GSO scintillators is $1.3{\mu}s,\;8.17{\mu}s$, 213 ns and 37 ns by a single photon method. The phoswich detector which was manufactured with plastic and CsI(Tl) scintillators could separate the ${\beta}$ particle and ${\gamma}$ ray. The phoswich detector could also measure the pulse height spectra of the ${\beta}$ particle and ${\gamma}$ ray by a PSD method. Phoswich 검출기를 제작하기 위하여 무기 섬광체인 CsI(Tl), $CdWO_4(CWO),\;Bi_4Ge_3O_{12}(BGO)$와 $Gd_2SiO_5:Ce(GSO)$의 특성을 연구하였다. CsI(Tl), CWO, BGO 및 GSO 섬광체의 radioluminescence 중심파장은 550 nm, 475 nm, 490 nm 및 440 nm이였고, neutral filter를 사용하여 측정한 CsI(Tl), CWO, BGO 및 GSO 섬광체의 절대광량은 각각 54890 phonon/MeV, 17762 phonon/MeV, 8322 phonon/MeV 및 8932 phonon/MeV이였으며, single photon method로 측정한 형광감쇠시간은 각각 $1.3{\mu}s,\;8.17{\mu}s$, 213 ns 및 37 ns이였다. 플라스틱 섬광체와 CsI(Tl) 섬광체를 사용하여 phoswich 검출기를 제작하였고 PSD(pulse shape discriminator) 방법으로 ${\beta}$ 입자와 ${\gamma}$ 선을 구별하며 각각의 방사선에 대한 파고 스펙트럼을 측정하였다.
Particularities of ZnSe-Based Scintillators for a Spectrometry of Charged Particles and Gamma Quanta
이우교,김용균,김종경,서효진,K Katrunov,N Starzhinskiy,O Zelenskaya,O Vyagin,V Ryzhikov 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.I
The spectrometric characteristics of zinc-selenide-based scintillators under alpha, beta, andgamma excitations have been investigated. The optimal conditions of signal collection for energyresolution measurements have been determined. The resolution of ZnSe(O)-Si-PD (PD =photodiode) for alpha particles (239Pu, E = 5.15 MeV) is 3.1 %; for the beta particles (207Bi, E= 976 keV), it is 3.7 %; and for gamma quanta (137Cs, E = 662 keV), it is 6.3 %. High lightoutput, satisfactory energy resolution, and an /ratio which close to one allow for application ofZnSe-based scintillators for alpha particle, beta particle, and gamma quanta identification.