• Title, Summary, Keyword: EPMA

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Characterization of Asian Dust Using Ultrathin Window EPMA (Ultrathin Window EPMA를 이용한 황사입자의 특성 분석)

  • ;;;;R. Van Grieken
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • pp.393-394
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    • 1999
  • 최근에 개발된 ultrathin window를 장착한 electron probe X-ray microanalysis(EPMA) 분석법(Ro et. el., 1999; Osan et. al., 1999; Szaloki et. al., 1999)은 종래의 통상적인 EPMA 방법으로는 분석하기 어려웠던 탄소, 질소, 산소 등의 원소를 정량적으로 분석할 수 있는 가능성을 제시하였다. 개개 입자의 형태와 크기 뿐 아니라 화학조성에 대한 정보를 제공하는 EPMA 분석법은 대기 중 개개 입자에 대한 생성, 이동, 반응 및 소멸에 관한 자세한 정보를 제공하기 때문에 지난 20여 년간 이 분석법을 사용하여 많은 연구가 진행되어 왔다.(중략)

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Analysis of High Radioactive Materials in Irradiated DUPIC SIMFUEL Using EPMA (EPMA를 이용한 DUPIC 사용후 핵연료 핵분열 생성물의 특성 분석)

  • 정양홍;유병옥;주용선;이종원;정인하;김명한
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.2 no.2
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    • pp.125-133
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    • 2004
  • Fission products of DUPIC (Direct Use of Spent PWR Fuel in CANDU Reactors) fuel, irradiated in HANARO research reactor with 61 ㎾/m of maximum linear power and 1,770 ㎿d/tU of average burn-up, was characterized by EPMA(Electron Probe Micro Analyzer). In order to find accurate characterization, the analysis results by EPMA of fresh simulated DUPIC fuel containing fission products as chemicals were compared with that of wet chemical analysis. The metallic precipitates observed at the center of the fresh simulated DUPIC fuel were about 1 $\mu\textrm{m}$ in size and their major components by EPMA were Mo-53.89 at.%, Ru-37.40 at.%, and Pd+Rh-8.71 at.%. Established procedure through the fresh simulated DUPIC fuel was applied to the irradiated DUPIC fuel. Observed size of metallic precipitates were 2∼2.5 $\mu\textrm{m}$ and their compositions were Mo-47.34 at.%, Ru-46 at.%, and Pd+Rh-6.65 at.%. What are uncommon things for this experiment, special treatment for improving the conductivity was attempted to the specimen and the conditions of exact irradiation of electron beam to small metallic precipitate were suggested.

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EPMA Analysis of Inter-reaction Layer in Irradiated U3Si-Al Fuels (EPMA를 이용한 U3Si/Al 조사 핵연료의 반응층 분석)

  • Jung, Yang-Hong;Yoo, Byung-Ok;Kim, Hee-Moon;Park, Jong-Man;Kim, Myung-Han
    • Analytical Science and Technology
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    • v.17 no.4
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    • pp.355-362
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    • 2004
  • Fission products and Inter reaction layer of $U_3Si-Al$ dispersion fuel, irradiated in HANARO research reactor with 121 kW/m of maximum liner power and 63 at% of average burn-up, was characterization by EPMA (Electron Probe Micro Analyzer). The fuel punching system developed by Irradiated Materials Examination Facility (IMEF) has used to make these samples for the EPMA. With this system a very small and thin specimen which is 1.57 mm in diameter and 2 mm in thickness respectively has been fabricated to protect the EPMA operator from high radioactive fuel and to mini-mize the equivalent dose rate less than 150 mSv/h. EPMA was performed to observe layers of sectional, Inter-reaction and oxide with specimens of cutting and polished. Stoichiometry in the Inter-reaction layer with $16{\mu}m$ of thickness was $U_{2.84}$ Si $Al_{14}$ with calibration of $UO_2$ and $U_{3.24}$ Si $Al_{14.1}$ with calibration of standard specimen. metallic precipitates in this layer were not observed using fission products examination.

The Surface Characteristics of Chlorinated Wiper Blade Rubber using EPMA (EPMA를 이용한 염소 처리된 와이퍼 블레이드 고무의 표면 특성 연구)

  • Rho, Seung-Baik
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.5
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    • pp.3292-3297
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    • 2014
  • The vehicle wiper blade(W/B) to lower the friction coefficient of the rubber surface after the surface treatment with chlorine were investigated. IR spectrum from W/B was used to determine the extent of chlorination of the rubber surface. Coefficient of friction is significantly reduced by the treatment with chlorine. In particular, the more sensitive influence on the initial chlorination. Rubber surface properties with respect to the longitudinal direction of the cutting plane were obtained by EPMA line analysis results. Penetration depth by EPMA chlorine concentration($20.0{\ell}$ of water for 35.0% hydrochloric acid(HCl) $300m{\ell}$ with 5.25% sodium hypochlorite(NaOCl) $400m{\ell}$), the chlorine treatment for 5 minutes was conducted to find that after 1.2 ${\mu}m$.

Analysis of CRUD Flake Applied to Abnormal High Beam Current by Shielded-EPMA

  • Jung, Y.H.;Baik, S.J.;Ahn, S.B.
    • Corrosion Science and Technology
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    • v.17 no.6
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    • pp.265-271
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    • 2018
  • CRUD specimens, scraped from twice-burned fuel cladding in the Korean Nuclear Power Plant, were analyzed using Shielded-EPMA. The principal elements of the CRUD were identified as Ni and Fe, at an approximate ratio of 1.3 Ni/Fe. To investigate the morphology and composition of the pure metallic materials in the CRUD, coolant impurities must be removed. This can be accomplished by increasing the EPMA current to an abnormally high intensity until the impurities are melted. Normally, EPMA applications are performed at conditions of 20 kV voltage and 20 nA current. But in our study, the applied current was increased up to 1200 nA, over time increments ranging from 5 to 30 seconds. This technique was performed by opening an adjustable aperture for the gun alignment. Results showed impurities contained in the CRUD material disappeared and pure metal materials, e.g., Ni and Fe, remained. This method presents an innovative way to analyze CRUD.

EPMA analysis of bone formation around RBM surface implant (RBM surface 임플란트의 골형성에 대한 EPMA 분석)

  • Jung, Hwan-Jong;Yim, Sung-Bin;Chung, Chin-Hyung;Hong, Ki-Seok
    • Journal of Periodontal and Implant Science
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    • v.38 no.3
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    • pp.503-510
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    • 2008
  • Purpose: To evaluate bone formation on the implant surface between machined fixture and RBM surface fixture through analyzing of distribution and concentration of Ca and P by EPMA. Material and Methods: Fixtures had divided in 2 group: Machined(Group I), RBM (Group II). Total 4 fixtures were implanted on rabbit which sacrificed on 2 week and 4 week for the histological specimens. By these specimens EPMA value were measured, compared and analysed by each group to figure out the evidence of clinical use of RBM implant. Result: After 2 weeks and 4 weeks, it was analyzed that bone formation area, distribution and concentration of Ca and P by EPMA. In distribution and concentration of P Group II was higher than Group I, but there were no statistical significances. In new bone formation area, Group II was more higher than Group I with statistically significances. Both of group, after 4 weeks area is little bit higher than after 2 weeks area but there is no statistically significances. Conclusion: RBM implant was better than machined implant on the early bone formation.

Analysis of Fission Products on Irradiated Fuels using EPMA (EPMA를 이용한 사용후핵연료의 연소도 측정에 관한 연구)

  • Jung, Yang-Hong;Yoo, Byung-Ok;Oh, Wan-Ho;Lee, Hong-Gy;Choo, Yong-Sun;Hong, Kwon-Pyo
    • Applied Microscopy
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    • v.35 no.3
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    • pp.113-119
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    • 2005
  • The Methodology of burnup calculation with EPMA test set up in this study. The spent fuel from PWR nuclear power plant was used as specimen. This $UO_2$ fuel with 3.2% of enrichment had been irradiated up to 35,000 MWd/MTU. The burnup is very important factor for nuclear fuel to estimate all fuel behaviors in reactor. To measure amounts of fission products and actinides for the burnup calcualation, destructive method analysis has been used but it makes long experimental time and second radio-wastes. In this study, EPMA test was available to measure amount of fission products. Neodymium is able to be detected and quantified. It can be compared with the results from chemical analysis and ORIGEN-2 code calculation. Concentration of Nd from EPMA test showed good agreement with result of ORIGEN-2 code in the same burnup.

Analysis of Fission Products on Irradiated Fuels using EPMA (EPMA를 이용한 사용후핵연료의 연소도 측정에 관한 연구)

  • JUNG Yang-Hong;YOO Byung-Ok;OH Wan-Ho;LEE Hong-Gy;CHOO Yong-Sun;HONG Kwon-Pyo
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • pp.335-343
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    • 2005
  • The Methodology of burnup calculation with EPMA test set up in this study. The spent fuel from PWR nuclear power plant was used as specimen. This $UO_2$ fuel with $3.2\%$ of enrichment had been irradiated up to 35,000 MWd/MTU(reference data). The burnup is very important factor for nuclear fuel to estimate all fuel behaviors in reactor. To measure amounts of fission products and actinides for the burnup calcualation, chemical analysis (destructive method) has been used but it mattes long experimental time and second radio-wastes. In this study, EPMA test was available to measure amount of fission products. Neodymium is able to be detected and quantified. It can be compared with the results from chemical analysis and ORIGEN-2 code calculation. Concentration of Nd from EPMA test showed good agreement with result of ORIGEN-2 code in the same burnup.

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Measurement of Porosity by EPMA-EDS Image Processing

  • Hung, Minhui;Li, Xiangting;Xia, Jiyu;Ding, Chuanxian
    • Journal of the Korean Vacuum Society
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    • v.6 no.S1
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    • pp.66-69
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    • 1997
  • Porosity is one important characteristic feature and structural index of sprayed coatings. A method of measurement of porosity, EPMA-EDS image processing is developed in the paper. The characteristics of pores can be determined by processing of the image obtained from an electron microscope via VISTA, Not only the porosity can be presented but also the statistical result of pore size distribution. Finally it can be drawn from this paper that EPMA-EDS is a quite effective method to completely characterize the pores in plasma sprayed coatings.

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