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실리콘 PIN 다이오드 검출기를 이용한 전자선량계 개발
이봉재,김봉환,장시영,김종수,Lee, B.J.,Kim, B.H.,Chang, S.Y.,Kim, J.S. 대한방사선방어학회 2000 방사선방어학회지 Vol.25 No.4
A prototype electronic dosimeter(PED) adopting a silicon PIN diode detector as a radiation detector has been developed, manufactured and test-evaluated. A radiation signal processing circuit has been electronically tested and then the radiation detection characteristics of this PED has been performance-tested by using a reference photon radiation field. As a result in a electronic performance test, radiation signals from a detector were well observed in the signal processing circuit. The radiation detection sensitivity of this PED after several test-irradiations to $^{137}Cs$ gamma radiation source appeared to be 1.85 cps/$Gy{\cdot}h^{-1}$ with 19.3% of the coefficient of variation, which satisfied the performance criteria for the active personnel radiation monitor. Further improvement of the electronic circuit and operating program will enable the PED to be used in personal monitoring purpose.
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Branched-Chain 아미노산 Aminotransferase에 관한 연구(IV) 악하선의 Branched-Chain Amino Acid Aminotransferase에 관하여
이봉재,장양섭,이근배,Lee, Bong-Jae,Chang, Ryang-Sub,Lee, Keun-Bai 생화학분자생물학회 1980 한국생화학회지 Vol.13 No.4
한우의 악하선에 있는 branched-chain아미노산 aminotransferase [EC 2.6.1.6]의 분포 및 isozyme의 pattern을 관찰하였다. 효소의 활성도는 Ichihara and Koyama의 방법으로 측정하였으며 isozyme은 ammonium sulfate에 의한 침전 및 DEAE-cellulose column chromatography에 의하여 분리하였다. 이상과 같이 하여 다음과 같은 결론을 얻었다. 1. 악하선의 branched-chain amino acid aminotransferase 활성도는 흰쥐의 정상조직인 심장, 장관 및 췌장에 비하여 낮았다. 2. BCAT는 세포질, mitochondria 및 핵분획에서 발견되며, 세포질에 약 85%, mitochondria에 약 8%, 핵분획에 약 6%가 분포되어 있었다. 3. 기질에 대한 효소활성도는 L-leucine이 가장 높았다. 4. 세포질에 있는 이 효소를 부분 정제하여 isozyme의 pattern을 관찰하기 위하여 DEAE-cellulose column chromatography를 행한 결과 용출액인 인산염 완충액의 농도가 20mM에서 Enzyme I 만이 검출되었다. 5. 소의 악하선에는 BCAT의 isozyme인 Enzyme II 및 III은 발견할 수 없었다. The activity and isozyme pattern of branched-chain amino acid aminotromsferase (EC 2.6.1.6) in bull submaxillary gland have been studied. The activity of branched-chain amino acid aminotransferase was measured by the method of Ichihara and Koyama. Isozyme pattern of this enzyme was also examined by using of DEAE-cellulose column chromatography. The results obtained were as follows; 1. In the bull submaxillary gland, the aminotransferase activities for branched-chain amino acids are relatively low compared with those in rat tissues, i, e., intestine, pancreas, and heart. 2. This enzyme was localized in the cytosolic, mitochondrial and nucleic fraction. About 85% of the total activity was found in the cytosolic fraction, 8% in the mitochondrial fraction and 6% in the nucleic fraction. 3. Cytosolic fraction of bull submaxillary gland contained Enzyme I, but not Enzyme II and III, of branched chain amino acid aminotransferase Enzyme I was eluted by 20mM phosphate buffer from DEAE-cellulose column and catalyzed the transamination of all three branched-chain amino acids, 4. The chromatographic elution profile of the Enzyme I from the bull submaxillary gland was very similar with those of normal rat liver and brain.
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이봉재,이윤식,허성철,김재호,김용재 대한이비인후과학회 2002 대한이비인후과학회지 두경부외과학 Vol.45 No.3
Background and Objectives:Organizing hematoma of the maxillary sinus can be developed by organizing procedure of hematoma in the unaerated maxilary sinus. To our knowledge, this is the second article describing organizing hematoma in the maxillary sinus. We experienced 7 cases recently, and aimed to describe clinical features, radiologic characteristics, and Materials and Methods:Seven patients were diagnosed as organizing hematoma pathologically. We reviewed computed tomography (CT) and medical records to find out clinical features of organizing hematoma of the max-illary sinus. Of seven patients, five were male and two were female. Their mean age was 49 years. Results:All patients had a history of frequent epistaxis without bleding tendency. They also complained of nasal obstruction, hyposmia, headache, nsities expanding the maxillary sinus with the minimal contrast enhancement. Destruction of the bony wall was observed in two patients. Endoscopic sinus surgery, Caldwell-Lucs operation, and Denkers operation were applied for the treatment singly or in combination, and resulted in successful outcome. Conclusion:Organizing hematoma should be included in the differ-ential diagnosis when patients have frequent epistaxis and expansile lesion in the maxillary sinus. (Korean J Otolaryngol 2002;45:245-8)
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TRIGA Mark-II, III 연구로 시절의 폐로를 위한 시설의 잔류 방사선/능 평가
이봉재,장시영,박승국,정운수,정기정,Lee, B.J.,Chang, S.Y.,Park, S.K.,Jung, W.S.,Jung, K.J. 대한방사선방어학회 1999 방사선방어학회지 Vol.24 No.2
Residual radiation and radioactivity level in TRIGA Mark-II, III research reactors and facilities at the KAERI Seoul site, which are to be decommissioned, have been measured, analyzed and evaluated to know the current status of radiation and radioactivity level and to establish and to provide the technical requirements for the safe decommissioning of the facilities which shall be applied in minimizing the radiation exposure for workers and in preventing the release of the radioactive materials to the environment. Radiation dose rate and surface radioactivity contamination level on the experimental equipments, floors, walls of the facilities, and the surface of the activated materials within the reactor pool structure were measured and evaluated. Radioactivity and radionuclides in the pool and cooling water were also analyzed. In case of the activated reactor pool structures which are very difficult to measure the radiation and radioactivity level, a computer code Fispin was additionally used for estimation of the residual radioactivity and radionuclides. The radiation and radioactivity data obtained in this study were effectively used as basic data for decontamination and dismantling plan for safe decommissioning of TRIGA Mark-II, III facilities.
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