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RISS 인기검색어
- 검색키워드
- 저자 : Sihhong Doh (검색결과 5 건)
- 무료
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Proton Beam Energy Monitoring with Radiation-Hard Crystal Scintillators
김홍주,Sihhong Doh,박환배,Heedong Kang,J.H So,Kyeryung Kim,유상수,S.C Yang,김성환 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
Monitoring of the energy profiles of protons in different beam configurations is important not only for understanding the characteristics of proton beam but also for understanding the light output response of a scintillation crystal. The energy profile of a proton beam was measured with several types of crystal scintillators by using 35- and 45-MeV proton beams from the MC-50 cyclotron at the Korea Institute of Radiological and Medical Sciences. Scintillation crystals of BGO, LYSO and GSO were used for the energy measurement of the proton beam. The pulse height spectrum and the energy resolution were measured for each crystal and compared with one another. The best energy resolution was 3 \% FWHM with the GSO crystal. Different thicknesses of energy degraders were used with the 35- and the 45-MeV proton incident energies to measure the light output response function of the BGO crystal.
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Measurement of Proton Beam Energy and Flux by Using a LYSO Crystal
강상준,김홍주,박환배,Heedong Kang,J. H. So,Kyeryung Kim,Sihhong Doh,Sungwhan Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
We investigated the beam profiles of the 45-MeV proton beam from the MC-50 cyclotron at Korea Institute of Radiological and Medical Science. We used a 45-MeV proton beam of 0.2-nA beam current to measure the beam energy and flux. The 45-MeV proton beam passed through a 0.2-cm thick aluminum window capping the beam pipe and then was collimated to a 1-mm-diameter beam spot by using a 1-mm aluminum collimator. We examined the dependence of the energy profile of the proton beam on the transverse distance from the beam center by using the LYSO crystal scintillator. Also, the flux of the proton beam was measured with the LYSO crystal scintillator. Accurate information on the energy profile of the beam is important not only for understanding the characteristic of the beam but also for understanding the light output response of a scintillation crystal. From our investigation, the energy profiles of the beam at the near point from the center and some distance points from the center were found to be very different. Thus, it is very important to test the energy profile of the beam at the point where the detector will be located before one performs the beam test for a detector, such as a silicon sensor.
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Proton-Induced Radiation Damage of Crystal Scintillators
김홍주,Heedong Kang,박환배,J.H. So,Kyeryung Kim,Sihhong Doh,김성환 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
We report results from a proton beam test to measure radiation damage and activation in crystal scintillators. Samples were irradiated with the 45 MeV proton beam from the MC-50 cyclotron at the Korea Institute of Radiological and Medical Sciences. Proton beam fluxes of 0.5 to 10 nA were used for the test. A PMT was attached to one side of the crystal and a 25 Mhz FADC (Flash Analog to Digital Converter) was used for the signal digitization. The light output and the energy resolution of the scintillation crystals with 662-keV gamma rays from a 137Cs radioactive source was measured prior to and after proton irradiation, and the result were compared with each other. Apart from an increase in the intrinsic activity, we did not observe any significant effect on the scintillation light output or the energy resolution of the LYSO crystal.
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강상준,S. J. Ha,Heedong Kang,박환배,J. H. So,Jinho Moon,Sihhong Doh,Kyeryung Kim,김성환,김홍주 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.5
We grew a CsI:CO3 single crystal with a concentration of CO3 of 0.02 mole percent by using the Czochralski method. We cut the crystal into a size of 10.3 mm in diameter and 10.9 mm in length. We investigated the luminance characteristics of the CsI:CO3 crystal including the fluorescence decay time, the energy resolution and the pulse height spectrum, by using a 661-keV γ-ray source. The light response of the CsI:CO3 crystal was measured for a proton beam in the energy range from 11 MeV to 36 MeV by using the MC-50 cyclotron at the Korea Institute of Radiological and Medical Sciences (KIRAMS) with different thicknesses of aluminum degraders. We estimated the energies of the proton beam after passing through the degraders and 190-cm-thick air by using a Monte Carlo simulation based on the Geant4 simulation toolkit. We show that the scintillation response of the CsI:CO3 crystal to a proton beam in the above energy range is approximately linear.
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Proton Beam Profile Monitoring by Using a GSO (Gd2SiO5) Crystal
M.H. Moon,김홍주,박환배,Heedong Kang,Jinho Moon,Kyeryung Kim,Sangpil Yun,Sihhong Doh,김성환 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
Flux monitoring of a proton beam profile is important for understanding the characteristics of a proton beam. The decay constant of a GSO (Gd$_2$SiO$_5$) crystal is small, and a GSO crystal has a higher light output than an organic scintillator crystal. The GSO crystal also has strong hardness against radiation. The flux profile of a proton beam from the MC-50 cyclotron at the Korea Institute of Radiological and Medical Sciences (KIRAMS) was measured using a GSO csystal. A 3.0-mm aluminum collimator was used for the beam collimation and for beam flux reduction. A photomultiplier tube (PMT) was attached on one side of the GSO crystal, and a counting method with an embedded CPU was used for the signal processing. We showed that the GSO crystal could be used for proton-beam profile monitoring.
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