Plastic 섬광검출기를 이용한 중성자의 분해능 및 광출력 연구

노태익,이대원,박상태,이삼열,양태건,김기동,IGASHIRA, M. 東亞大學校附設基礎科學硏究所 1997 基礎科學硏究論文集 Vol.14 No.1

Plastic 섬광검출기의 중성자에 대한 Response function을 작성하기 위한 기초연구로써, 중성자의 에너지에 따른 검출기의 분해능을 조사하였다. 또한 중성자에 의한 광출력을 측정하여 전자에 의한 광출력과 비교함으로써 중성자 에너지와 전자 에너지 사이의 관계식을 구하였다. 본 연구의 결과는 다른 연구자들과 비교함으로써 그 신뢰성을 확인하였으며 앞으로, Plastic 섬광검출기의 중성자에 대한 응답함수를 구성하는데 매우 중요한 자료가 된다. 또한 이 응답함수를 이용하여 unfolding 과정을 거치면 중성자 파고스펙트럼으로부터 중성자의 에너지 스펙트럼을 얻을 수 있다. In order to determine the response function of a plastic scintillator, we studied the resolution of a detector as a function of neutron energy. We also obtained a relation between the neutron energy and the electron energy by comparing the light output due to a neutron with that due to a neutron with that due to a electron. Using an unfolding process, we can obtain the spectra of the neutron energy from that of the neutron pulse height.

^19F(p, αγ)^16O 반응의 α-γ 각상관

박상태,김기동,이대원,정운혁,노태익,정성채,이종환,나상균 동의대학교 기초과학연구소 1994 基礎科學硏究論文集 Vol.4 No.1

The α-γ angular correlations in the ^19F(p, αγ)^16O reaction have been measured using a 500 keV VDG accelerator at E_p=340 keV and a CaF₂ taget prepared by evaporation in vaccum. The measurement of the α-γ angular correlation between the α-rays from the decay of ^20Ne into ^16O and the γ-rays from ^16O has been performed using a Si surface barrier detector and a NaI(TI) detector to determine the spin of the 13.196 MeV level in ^20Ne, and those of the 6.14 MeV and the ground level in ^16O, together with the orbital angular momentum of the emitted α's. The α-γ angular correlations in the ^19F(p, αγ)^16O reaction have been also calculated for the assumed spins of the 13.196 MeV level in ^20Ne, and those of the 6.14 MeV and ground level in ^16O. The spins of the levels under condsideration have been determined by comparison of the calculated values with experimental value. The result makes a good agreement to Arnold's data.

Plastic 섬광검출기의 감마선 스펙트럼에 대한 unfolding 분석

김기동,박상태,최선수,이대원,정운혁,이종환,노태익 동의대학교 기초과학연구소 1995 基礎科學硏究論文集 Vol.5 No.1

The γ-ray pulse height spectra from ^137Cs and ^22Na were measured with a plastic scintillation detector for the unfolding analysis of the γ-ray spectra. The energy deposition spectra were calculated using the Compton deposition cross section. The energy dependent resolution and its corresponding response matrix were determined by comparing the measured γ-ray pulse height spectra with the calculated energy deposition spectra. The energy spectra were obtained by unfolding the measured pulse height spectra with the response matrix.

상기도의 궤사성 병변에 대한 임상 및 병리조직학적 고찰

김태승,노재윤,최인준,이유복,김동식 대한병리학회 1978 Journal of Pathology and Translational Medicine Vol.12 No.1

²³Na(pγ)²⁴Mg반응을 이용한 ²⁴Mg의 13034 keV 공명준위의 분기율 및 스핀 결정

노태익,김기동,박상태,이대원,양태건,IGASHIRA, M. 東亞大學校附設基礎科學硏究所 1997 基礎科學硏究論文集 Vol.14 No.1

²⁴Mg 핵준위의 성질을 조사하기 위해, Ep=1424 keV에서 ²³Na(pγ)²⁴Mg 반응을 일으켰다. 입사 양성자 가속을 위해서 동경공업대학의 3 MeV Pelletron 가속기를 사용했고 방출된 감마선을 측정하기 위해 고순도(HP) Ge 검출기(식경 78.7 mm, 길이 86.5 mm)를 이용하였다. 표적은 순수 ²³Na을 Ta 판에 진공증착하여 만들었고, 표적내에서 빔의 에너지 손실은 1.381∼1.551 MeV의 입사 양성자에 대해 대략 150 keV이었다. 검출기의 에너지에 대한 검출효율 결정과 에너지 교정을 하기 위해 27Al(p,γ)28Si 반응(Ep=992 keV)의 감마선 에너지 스펙트럼을 이용했다. 본실험에서 ²⁴Mg 13054, 13034, 13965 keV의 세 공명준위를 얻었다. 특히 13034 keV 준위로부터 4239 keV, 5235 keV, 7617 keV, 9008 keV 준위로 전이할 때 각각의 분기율은 24.8±0.2%, 63.6±0.3%, 10.1±0.1%, 1.5±0.1% 이었다. 13034→4239 keV 전이에서 방출되는 감마선의 각분포를 측정한 결과 13034 keV 준위의 스핀값은 3+으로 결정되었다.

腸嵌入을 誘發한 小腸(回腸)腺癌 1症例 : One Case Report

盧在胤,崔松林,金建鐘,朴泰成,金春圭 中央醫學社 1970 中央醫學 Vol.18 No.2

Because of its relatively infrequency, difficulty of proper preoperative diagnosis and combined intussusception, one case of adenocarcinoma of the ileum is re2ported. The patient was 46 year-old male and complained intermittent abdominal pain and a palpable mass at right lower quadrant with the duration of one year. Except for a right lower abdominal mass, physical examination was negative. Laboratory examination disclosed hemoglobin 13.3 gm. per 100ml., hematocrit 43 per cent and white blood cell count 10,100 per cu. mm. Urinalyses and stool examination disclosed within normal limit. Barium enema revealed complete filling defect below the mid portion of the ascending colon. Grossly, the specimen was partial segment of surgically resected ileum and measures 9.2 cm in length and 3 cm in diameter. On the center of the specimen, relatively well circumscribed tumor mass revealed yellowish white in color and slightly hard in consistency. The histopathology of the lesion revealed focal ulceration and moderately well differentiated adenocarcinoma spread to muscle layer. A brief review of the literature was done.

태양에너지 사용을 위한 집열계통면 개발

윤수인,노동택,노지현,김정남 부산대학교 물성연구소 1982 물성연구소연구논문집 Vol.1 No.-

The measured solar absorptance and spectral emittance of the nickel black and chrome black coatings prepared by lectroplating at various plating current densities were reported. The cyclic heating and cooling technique was mployed for the absorptance measurement of these coatings. The nickel black coating with α=0.87 and ε(100℃)=0.25 was obtained by plating at 30℃ for 5minutes with the current density of 0.1A/dm². Where as the best chrome black coating with α=0.89 and ε(100℃)=0.21 was achieved by plating at 20℃ for one minute with the current density of 100A/dm². Accelerated humidiry and themal durabilitys test result on these coatings was also reported.

Hohlraum로를 이용한 불투명체의 Hemispherical Angular Monochromatic 반사율 측정

윤수인,노동택,노지현 부산대학교 1978 論文集 Vol.26 No.2

An instrument and method of measuring monochromatic hemispherical reflectances of opaque materials are described. In this method a cool sample is exposed is exposed to blackbody radiation from a high temperature source and the monochromatic radiation reflected from the surface is compared to the blackbody radiation from the cavity at that wavelength. The data are thus hemispherical angular monochromatic reflectances. The reflectances of copper black, nickel black and several other black paints are measured by this method.

태양에너지 이용을 위한 집열계통 개발에 관한 연구

윤수인,노동택,노지현 부산대학교 물성연구소 1982 물성연구소연구논문집 Vol.1 No.-

The nickel-zinc-sulfide complex known as nickel black is produced on nickel and galvanized iron bases by the electro-deposition method. The nickel-black-on-nickel selective surfaces give an absorptance of 0.91 and emittance of 0.40. Whereas the nickel-black-on-galvanized-iron selective surfaces give an absorptance of 0.95 and emittance of 0.30. The copper black coatings produced on an aluminum base by using dipping and baking techniques give an absorptance of 0.94 and emittance of 0.42 An absorptance of 0.3 can often be obtained with almost no effect on the emittance of the base; however, by the time absorptance has been raised to 0.9, by using thicker lauyers or other changes in the recipe, the emittance has risen considerably. According to the detailed analysis of the efficiency of the flat-plate solar heat the collector, selective surfaces show better efficiency than the nonselective surfaces.

대기로 확산된 방사성물질로부터 방출되는 감마선에 의한 피폭선량을 계산하기 위한 근사화 방법

김태욱,박종묵,노성기 대한방사선 방어학회 1990 방사선방어학회지 Vol.15 No.2

대기로 방출된 방사성 물질의 대기 확산 형태를 파스킬의 대기안정도에 따른 모델인 타원형 근사화 모델로 가정하고 인체가 받을 수 있는 감마선에 의한 피폭선량률을 계산하였다. 이 결과를 대기 확산 기본 모델인 가우스플룸 모델을 적용하여 계산한 결과 및 이미 발표된 원형 근사화 모델에 의한 결과와 비교하여 보았다. 제시한 타원형 근사화 모델을 이용하여 피폭선량을 계산한 결과는가우스풀룸 모델의 결과와 비슷하고, 원형 근사화 모델의 경우보다 오차가 적었으며, 동시에 기본 모델인 가우스 풀룸 모델과 비교할 때 1/40정도의 계산 시간이 걸렸다. The dispersing model of radioactive plume in the atmosphere was assumed to form finite ellipseshaped volumes rather than a single plume and gamma absorbed doses from the plume were computed using the proposed model. The results obtained were compared with those computed by the Gaussian plume and the circular approximation models. The results computed by the proposed ellipse-shaped approximation model were close to those by the Gaussian plume model, and more accurate than those by the circular approximation model. The computing time for the proposed approximation model was one fortieth of that for the Gaussian plume model.