• Title, Summary, Keyword: instrumental neutron activation analysis

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CHARACTERISTICS OF A NEW PNEUMATIC TRANSFER SYSTEM FOR A NEUTRON ACTIVATION ANALYSIS AT THE HANARO RESEARCH REACTOR

  • Chung, Yong-Sam;Kim, Sun-Ha;Moon, Jong-Hwa;Baek, Sung-Yeol;Kim, Hark-Rho;Kim, Young-Jin
    • Nuclear Engineering and Technology
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    • v.41 no.6
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    • pp.813-820
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    • 2009
  • A rapid pneumatic transfer system (PTS) for an instrumental neutron activation analysis (INAA) is developed as an automatic irradiation facility involving the measurement of a short half-life nuclide and a delayed neutron counting system. Three new PTS designs with improved functions were constructed at the HANARO research reactor in 2006. The new system is composed of a manual system and an automatic system for both an INAA and a delayed neutron activation analysis (DNAA). The design and basic conception of a modified PTS are described, and the functions of system operation and control, radiation protection and emissions of radioactive gas are improved. In addition, a form of capsule transportation of these systems is tested. The experimental results pertaining to the irradiation characteristics with variation of the neutron flux and the temperature of the irradiation position with the irradiation time are presented, as is an analysis of the reference material for analytical quality control and uncertainty assessments.

Determination of trace elements in food reference materials by instrumental neutron activation analysis

  • Cho, K.H.;Zeisler, R.;Park, K.W.
    • Analytical Science and Technology
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    • v.18 no.6
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    • pp.520-528
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    • 2005
  • Two biological Certified Reference Materials (CRMs), KRISS 108-04-001 (oyster tissue) and 108-05-001 (water dropwort stem), were prepared by Korea Research Institute of Standards and Science (KRISS)during FY '01. The certified values of these materials had been determined by Isotope Dilution Mass Spectrometry (IDMS) for six elements (Cd, Cr, Cu, Fe, Pb and Zn). Additional analytical works are now progressing to certify the concentrations of a number of the environmental and nutrimental elements in these CRMs. The certified values in a CRM are usually determined by using a single primary method with confirmation by other method(s) or using two independent critically-evaluated methods. Instrumental Neutron Activation Analysis (INAA) plays an important role in the determination of certified values as it can eliminate the possibility of common error sources resulting from sample dissolution. In this study INAA procedure was used in determination of 23 elements in these two biological CRMs to acquire the concentration information and the results were compared with KRISS certified values.

ACTIVATION ANALYSIS OF ENVIRONMENTAL SAMPLES USING THE MT-25 MICROTRON OF THE FLNR

  • Maslov, O.D.;Belov, A.G.;Starodub, G.Ya.;Dmitriev, S.N.
    • Analytical Science and Technology
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    • v.8 no.4
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    • pp.815-820
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    • 1995
  • Instrumental neutron and gamma activation analysis of coal and combustion products, determination of platinum content in natural samples by radiochemical gamma activation analysis and high-sensitive track method of thorium determination has been studied with the use of the MT-25 microtron.The optimal conditions for complete elemental analysis of coal and combustion products, isolation and determination of platinum and thorium are recommended.

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Measurement of the Elemental Composition in Airborne Particulate Matter Using Instrumental Neutron Activation Analys

  • Chung, Yong-Sam;Lim, Jong-Myoung;Moon, Jong-Hwa;Kim, Sun-Ha;Cho, Hyun-Je;Kim, Young-Jin
    • Nuclear Engineering and Technology
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    • v.36 no.5
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    • pp.450-459
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    • 2004
  • For the evaluation of emission sources by air sampling, airborne particulate matter for fine (<2.5 ${\mu}m2$ EAD : $PM_{2.5}$) and coarse partical (2.5-10 ${\mu}m2$ EAD : $PM_{2.5-10}$ fractions were collected using a Gent stacked filter unit low volume sampler and two types of polycarbonate filters. Air samples were collected twice monthly at two regions in and around Daejeon city in the Republic of Korea from January to December 2002. Monthly mass concentration of $PM_{2.5}$ and $PM_{2.5-10}$ were measured and the concentrations of 10 marker elements (Al, Sc, Ti ; Na, Cl ; As, V. Sb, Br, Se) were determined by an instrumental neutron activation analysis. Analytical quality control was corried out using certified reference materials. Enrichment factors were also calculated from the monitoring data to classify the anthropogenic and crustal origins.

THE DISTRIBUTION CHARACTERISTICS OF TRACE ELEMENTS IN AIRBORNE PARTICULATES FROM AN URBAN INDUSTRIAL COMPLEX AREA OF KOREA USING INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS

  • LIM JONG-MYOUNG;LEE JIN-HONG;CHUNG YONG-SAM
    • Nuclear Engineering and Technology
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    • v.37 no.5
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    • pp.503-510
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    • 2005
  • An instrumental neutron activation analysis was used to measure the concentrations of about 24 elements associated with airborne particulates (PM10) that were collected in the most polluted urban region of Daejeon city, Korea from 2000 to 2002. Using the measurement data for various elements, both the extent of elemental pollution in the study area and the seasonality in their distribution characteristics were examined. Examinations of their distribution patterns indicated that most elements with crustal origin tend to exhibit seasonal peaks during spring, while most elements with anthropogenic origin tend to exhibit seasonal peaks during fall or winter. In order to explain the factors regulating their mobilization properties, the data were processed by a factor analysis. Results of the factor analysis suggested competing roles of both industrial and natural source processes, despite that the study site is located at a downwind position of the industrial complex. Based on the overall results of this study, it is concluded that the site may be strongly impacted by man-made sources but the general patterns of elemental distributions in the study area inspected over a seasonal scale are quite consistent with those typically observed from natural environment.

Data intercomparison and determination of toxic and trace elements in Algae using Instrumental Neutron Activation Analysis (중성자방사화분석에 의한 Algae중의 독성미량원소의 정량 및 실험실간 비교검증)

  • Chung, Yong-Sam;Moon, Jong-Hwa;Park, Kwang-Won;Lee, KiI-Yong;Yoon, Yoon-Yeol
    • Analytical Science and Technology
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    • v.12 no.4
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    • pp.346-353
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    • 1999
  • For the non-destructive multi-elemental analysis of environmental and biological materials, instrumental neutron activation analysis (INAA) was applied for the determination of toxic and trace elements in a set of three Algae samples provided by the International Atomic Energy Agency (IAEA). The analytical quality control was evaluated by comparing the analytical results of two standard reference materials of the National Institute of Standards and Technology (NIST); Oyster Tissue (SRM 1566a) and Citrus Leaves (SRM 1572). According to given analytical procedure, the concentration of 15-25 elements including spiked elements such as As, Cd, Cr and Hg in Algae samples were determined. To identify and validate these results, a data intercomparison program using more than 35 analytical methods in 150 laboratories was carried out and the estimated statistical data are summarized. Result of INAA is favorable, therefore, it is illustrated that can be applied for routine analysis of essential and toxic elements in algae samples as well as analytical quality assurance.

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Characteristics of Respirable Particulate Matter from the Third and Fourth Industrial Complex Area of Daejeon City Using Instrumental Neutron Activation Analysis (기기중성자방사화분석을 이용한 대전 3, 4 공단지역의 호흡성입자의 특성)

  • Lim, Joung-Myoung;Lee, Jin-Hong
    • Journal of Environmental Impact Assessment
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    • v.15 no.6
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    • pp.425-433
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    • 2006
  • Instrumental neutron activation analysis was used to measure the concentrations of 27 elements associated with respirable particulate matter (PM10) that were collected from the Third and Fourth Industrial Complex Area of Daejeon City. The distribution patterns of elements were clearly distinguished with their concentrations varying across more than four orders of magnitude. The mean for Al were recorded to be the highest value of 1,527 $ng/m^3$, while that for In showed the lowest value of 0.1 $ng/m^3$. If compared in terms of enrichment factors, it was found that certain elements (e.g., As, Br, Cl, Cr, I, In, Sb, Se, and Zn) are enriched in PM10 samples of the study site. The results of factor analysis indicated six factors with statistical significance, which may exert dominant controls on regulating the elemental concentration levels in the study area.

Determination of Trace Elements in Airborne Particulates by Instrumental Neutron Activation Analysis (중성자 방사화분석법을 이용한 대기분진시료의 정량)

  • Chung, Yong-Sam;Chung, Young-Ju;Jeong, Eui-Sik;Cho, Seung-Yeon
    • Nuclear Engineering and Technology
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    • v.27 no.2
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    • pp.234-247
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    • 1995
  • Trace elements in airborne particulates were analyzed by instrumental neutron activation analysis (INAA) under the optimum analytical condition. Neutron irradiation for sample was done at the irradiation hole(neutron flux 1$\times$10$^{13}$ n/$\textrm{cm}^2$.s) of TRIGA MARK-III research reactor in the Korea Atomic Energy Research Institute. For the verification of the analytical method, NIST SRM-1648 and NIES CRM No.8 ore chosen and analyzed. The accuracy and precision of the analysis of 40 and 24 trace elements in the samples were compared with the certified and reported values, respectively. The analytical method was found to be reliable enough when the analytical data of NIES sample were compared with those of different counties. In the analytical result of two or both of standard reference materials, relative standard deviation wes within the 15% except a few elements and the relative error was within the 10%. We used this method to analyze 30 trace elements in airborne particulates collected with the high volume air sampler(PM-10) at too different locations and also confirmed the possibility to use this method as a routine monitoring tool to find out environmental pollution sources.

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Determination of Toxic Elements in Polymer Materials Using Instrumental Neutron Activation Analysis

  • Park, Kwang-Won;Lee, Joung-Hae;Cho, Kyung-Haeng;Min, Hyung-Sik;Lim, Myung-Chul;Choi, Duk-Soo
    • Bulletin of the Korean Chemical Society
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    • v.29 no.7
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    • pp.1391-1394
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    • 2008
  • Polymer materials are very difficult to decompose for the purpose of chemical analysis. Nondestructive analysis without pretreatment provides a suitable solution that will overcome this obstacle. In this study, CRM candidate samples that contained toxic elements such as As, Cd, Cr and Zn in a polypropylene (PP) were analyzed using instrumental neutron activation analysis (INAA). The analytical results were obtained from ten samples selected by random sampling at two different concentration levels (low and high). Particular attention was paid to reducing analytical errors and evaluating the associated uncertainty.

Intercomparison and Determination of Trace Elements in Urban Dust by Neutron Activation Analysis (중성자방사화분석법을 이용한 대기분진중의 미량원소 비교분석)

  • Chung, Yong-Sam;Moon, Jong-Hwa;Kim, Sun-Ha;Park, Kwang-Won;Kang, Sang-Hun
    • Analytical Science and Technology
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    • v.13 no.2
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    • pp.179-188
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    • 2000
  • Trace elements in air samples artificially loaded on filters with urban dust and the bulk material of urban dust as an environmental sample were determined non-destructively using instrumental neutron activation analysis. Standard reference material (Urban Dust, SRM 1648) of the National Institute of Standard and Technology was used for the analytical quality control. The relative error for 37 elements was less than 15% and the standard deviation was less than 10%. 29 elements in the urban dust and 21 elements in the loaded filter sample were determined respectively. To evaluate the proficiency and reliability of the measurement, data intercomparison was performed and 39 analytical laboratories participated in the analysis using different analytical methods; neutron activation analysis, particle induced X-ray emission analysis, X-ray fluorescence analysis and atomic absorption spectrometry. Z-scores were calculated using the standard deviation of the laboratorie's mean as target standard deviation, and a good result was obtained that the values fall between -1 and +1 except some elements.

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