(A) study on csi(tl) scintillator thin film characteristics for medical x-ray digital radiography = 의료용 X-Ray 디지털 래디오그래피를 위한 CsI(Tl) 섬광체 박막특성에 관한 연구

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Digital Radiography systems have currently developed and are replacing the conventional X-ray film. In indirect detector of digital radiography systems, the scintillating layer coupled to amorphous silicon photodiode converts the X-ray in to visible light. And also scintillators are the primary radiation sensor in many applications such as medical diagnostics, medical radiographs, and industrial component inspection. Among many various scintillators, T1-activated CsI scintillator is the most promising material for digital radiography. In this study, thin CsI(Tl) scintillation layers were fabricated by thermal vacuum evaporation of mixture of CsI and T1I2 powder. The thin films with various microstructures were manufactured in accordance with pressure, substrate temperature and substrate material. Due to proper evaporation parameters, thin films with porous, dense and columnar polycrystalline structure were manufactured very well. The manufactured thin films with different microstructures were annealed by rapid thermal annealing method. And the annealed thin films were measured for optical characteristics such like visible light transmittance and light output under X-ray exposure as different microstructures. And then in order to evaluate the spatial resolution in accordance with porous, dense, columnar microstructure, Modulation Transfer Function (MTF) curve was measured and analyzed by Charge Coupled Device (CCD) detector.
Advisors
Cho, Gyu-Seongresearcher조규성researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2006
Identifier
255369/325007  / 020043607
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2006.2, [ v, 57 p. ]

Keywords

thin film; CsI(Tl) scintillator; Digital radiography; PVD; 물리적 기상 증착; 박막; 무기질 섬광체; 디지털 래디오그래피

URI
http://hdl.handle.net/10203/49504
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=255369&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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