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- 저자 : 朱寬植 (검색결과 101 건)
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아르곤, 헬륨, 공기, 아르곤(90%), 메탄(10%) 기체를 통과할때 알파입자의 에너지 손실
주관식,정원모,한정훈 명지대학교 1985 明大論文集 Vol.16 No.-
The energy loss α-particles passing through Ar, He, and Ar(90%)+CH_4(10%) were detected using a Silicon Surface Barrier Detector and the energy shifts of the α-particles were observed by Multichannel Analyzer. The observed energy loss agreed with the calculated value within 6.4% in the region above 2MeV for the single atom gases. For the mixed gases, agreement is within 9.5%. The stopping cross section was calculated from the distance traveled in the gas and the energy loss relation.
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Ge(Li)검출기에 의한 ^99Tc의 에너지 준위 결정에 관한 연구
朱寬植 명지대학교 1983 明大論文集 Vol.14 No.-
The radioactive decay of 66.7 hour ^(99)Mo has been studied by measuring single gamma-ray spectra, gamma-gamma coincidences. Through single gamma-ray spectra using Ge(Li) detector, energies and relative intensities of twenty one gamma-rays were obtained. Gamma-gamma coincidences with Ge(Li) and NaI(T1) detectors, and sum-relations were used in determination of its fourteen energy levels. The resulting decay scheme consists of levels at 140.5, 142.9, 181.1, 509, 534.3, 671.5, 761, 920.5, 1,1003.9, 1,105, 1,129.3, 1,142.1, 1,169.3, and 1,199.8 kev.
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주관식,박일진,김종호,남기용,백승화,Ju, Gwan-Sik,Park, Il-Jin,Kim, Jong-Ho,Nam, Gi-Yong,Baek, Seung-Hwa 대한의용생체공학회 1997 의공학회지 Vol.18 No.3
3.6cm${\times}$2.0cm (지름 ${\times}$ 두께) 크기의 $BaF^2$ 섬광체로 검출기를 제작하여 감마 카메라등 의료용 진단장치에서 센서로 사용되고 있는 NaI(씨)검출기와 방사선 검출특성을 비교하여 보았다. 특정에 사용된 선원은 $^{22}Na,\;^{54}Mn,\;^{57}Co,\;^{137}Cs$의 ${\gamma}$선 방출선원으로 검출기와 선원간의 거리를 7cm로 유지하였다. 시간특성을 분석하기 위하여 511keV의 양전자 방출선원을 사용하여 NaI(Tl)(1" ${\times}$ 1"), NaI(Tl)(3" ${\times}$ 3")순으로 $BaF^2$가 가장 빠르게 나타났으며, $BaF^2$ 검출기의 효율은 500keV에서 가장 높게 측정되었다. he scintillation detector having $BaF^2$ crystal with 3.6cm dia${\times}$2.0 cm thick was provided. The energy and timing characteristics were measured and compared with NaI(Tl) scintillation detectors, which widely used in unclear medicine. In order to measure the energy spectrum, the radioactive sources used were $^{22}Na,\;^{54}Mn,\;^{57}Co,\;^{137}Cs$ and the source to detector distance was 7cm. For the timing characteristic, NaI(Tl)(1" ${\times}$ 1")-$BaF^2$ and NaI(Tl)(3" ${\times}$ 3")-$BaF^2$ timing coincidence systems were prepared and the used source was $^{22}Na$ emitting 511keV annihilation photons. For the 511keV gamma-ray emitted from $^{22}Na$, It was revealed that the timing response of the $BaF^2$ detector was faster than NaI(Tl)(1" ${\times}$ 1") and NaI(Tl)(3" ${\times}$ 3") detector used in this experimental investigation. The energy characteristics of the $BaF^2$ detector had a good values for about 500keV energy range.
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LCD 도광판(Light Guide Plate) 두께에 따른 휘도에 관한 연구
주관식,이중원,박명균 명지대학교 자연과학연구소 2006 자연과학논문집 Vol.25 No.-
LCD BLU(Back Light Unit)의 구성 부품 중 에서 도광판(Lignt Guide Plate)은 LCD의 성능에 가장 큰 영향을 주는 핵심 부품이다. 동일한 성형 조건에 의해 사출된 도광판을 두께가 얇아짐에 따라 발생되는 휘도의 불균형을 관찰하고 패턴 인쇄를 수정하여 균일도가 향상된 두께 0.4t도광판을 생산하였다. 또한 이는 기존 모바일 폰 제품에 일반적으로 사용되는 두께 0.6t에 비해 휘도의 균일도가 향상됨을 실험적으로 검증하였다.
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Ge(Li) Spectrometer에 의한 검출 효율 및 Eu¹5²→Sm¹5²의 방사능 측정
최점수,주관식 釜山水産大學校 1992 釜山水産大學 硏究報告 Vol.32 No.1
Activity determination for Eu-152 has been carried out by means of photopeak analysis using the computerized gamma-ray spectrometry system which consists of 8192 channel pulse height analyzer, 76� Ge(Li)detector, and LSI-� computer. For the prior determinations of photopeak efficency of the detector as a function of incident photon energy, an Eu-152 was used. The activity of Eu-152 was determined through the computation of the photopeak area and the successive operation of previously determined photopeak efficency and relevent correction factors to the peak area. The result shows that determined activity of Eu-152 agree with the given standardized value within 2%. Through this study it is concluded that the activity of gamma emitting nuclides with relatively simple decay schemes like Eu-152 can be determined with an uncerntainity better than 2% by means of gamma-ray spectrometry using our system.
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임종혁,김종호,박일진,주관식 명지대학교 자연과학연구소 1995 자연과학논문집 Vol.12 No.-
차폐체의 종류에 따른 전자파의 차폐효과를 파장이 다른 두 광원을 사용하여 비교하였다. 그 결과 실효 원자 번호가 큰 Gold -Silver , Stainless Steel, Nickel-Chromium, Titanium순으로 차폐효율이 큰 것을 알 수 있었으며, 파장이 큰 적외선이 자외선이나 가시광선보다 차폐효율이 좋은 것으로 판명되었다. The absorptivities of electromagnetic wave shilding materials were measured at the two different wave lengthes.The absorptivity increases as the atomic number increases;the order of Gold-Silver, Stainless steel, Nickel-Chromium and Titanium. The absorption of imfrared ray is more effective than ultravioletor visible light in electromagnetic wave shilding.
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NaI(Tl) 섬광결정과 위치민감형 광전자증배관을 이용한 소형 감마카메라의 신호 특성 고찰
주관식,김준영,이경한,최용,김병태,김종호,김상은,최연성,임기천 대한핵의학회 2000 핵의학 분자영상 Vol.34 No.1
Purpose: We characterized the signals obtained from the components of a small gamma camera using NaI(Tl)-position sensitive photomultiplier tube (PSPMT) and optimized the parameters employed in the modules of the system. Materials and Methods: The small gamma camera system consists of a NaI(Tl) crystal (60×60×6 mm3) coupled with a Hamamatsu R3941 PSPMT, a resister chain circuit, preamplifiers, nuclear instrument modules (NIMs), an analog to digital converter and a personal computer for control and display. The PSPMT was read out using a resistive charge division circuit which multiplexes the 34 cross wire anode channels into 4 signals (X+, X, Y+, Y). Those signals were individually amplified by four preamplifiers and then, shaped and amplified by amplifiers. The signals were discriminated and digitized via triggering signal and used to localize the position of an event by applying the Anger logic. The gamma camera control and image display was performed by a program implemented using a graphic software.ults: The characteristics of signal and the parameters employed in each module of the system were presented. The intrinsic sensitivity of the system was approximately 8×103 counts/sec/μCi. The intrinsic energy resolution of the system was 18% FWHM at 140 keV. The spatial resolution obtained using a line-slit mask and 99mTc point source were, respectively, 2.2 and 2.3 mm FWHM in X and Y directions. Breast phantom containing 2∼7 mm diameter spheres was successfully imaged with a parallel hole collimator. The image displayed accurate size and activity distribution over the imaging field of view. Conclusion: We proposed a simple method for development of a small gamma camera and presented the characteristics of the signals from the system and the optimized parameters used in the modules of the small gamma camera. (Korean J Nucl Med 2000;34:82-93)
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주관식 세계기독교통일신령협회 2005 統一世界 Vol.- No.6
인자요산 지자요수 어진 이는 산을 좋아하고 지혜로운 자는 물을 좋아한다 바늘구멍에도 물은 빠져나가는데 하늘구멍 뚫렸어도 언제나 버틴 산 산수원 애국심 어깨동무하고서 그 산 배우려 산으로 가세 오를수록 넓은 세상 포요하는 마음 의사 없는 병원 찾아 산으로 가자 야호 야호 하니 야호 야호 하고 나는 너가 좋다하니 나는 너가 좋다하고 나는 너가 싫다하니 나는 너가 싫다하는 산울림의 대꾸를 너는 들었나 악심을 토하고 선심을 마시면 네 옆이 천국이요 극락일진데 산심이 선심이요 수심이 양심인데 태산 같은 굳은 마음 북방산 갈 때까지 변함 없어라.
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