• Title/Summary/Keyword: X-선 형광분석

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Noise Characteristic Analysis of X-Ray Fluorescence Spectrum (형광 X-선 스펙트럼의 잡음 특징 분석)

  • Lee, Jae-Hwan;Chon, Sun-Il;Yang, Sang-Hoon;Park, Dong-Sun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.5
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    • pp.2298-2304
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    • 2012
  • X-ray fluorescence spectrum analysis method can be applied in many areas, including concentration analysis of RoHS elements and heavy metals etc. and we can get analysis results in a relatively short time. Because X-ray fluorescence spectrum has noises and several artifacts that lowers the accuracy of the analysis. This paper analyzes the characteristics of the noise of the X-ray fluorescence spectrum to increase the accuracy of analysis. X-ray fluorescence spectrum have the characteristics of shot noise (Poisson noise), so the noise size is relatively large in the small signal portion and the noise the size is relatively small in the large part of the signal. Existing methods of analysis and to remove noises is a method for general purposes algorithm. Since these algorithm does not reflect these noise characteristics, we get distorted analysis result. We can design efficient noise remove algorithm based on the accurate noise analysis method, and we expect high accuracy results of the elemental concentration analysis result.

X-ray Fluorescence Analysis of Chemical Ingredients for Portland Cement (X-선 형광분석법에 의한 포틀란드 시멘트의 정량분석)

  • 임헌진;백연봉;김도생;윤준수;이경원
    • Journal of the Korean Ceramic Society
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    • v.33 no.8
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    • pp.928-934
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    • 1996
  • Quantitative analysis each portland cement components was conducted by standard calibration method using X-ray fluorescence spectrometer. Standard sample and the unknown sample were prepared by fused cast bead method. In checking the errors of standard cement 227A372 the relative errors of constituents such as CaO, SiO2, Al2O3, Fe2O3, MgO and SrO were less than 1% and the relative errors of constituents such as So3, K2O, TiO2, Na2O P2O5, and Mn2O3 were less than 5% Sample preparation was mainly contributed to the errors. Compared with general wet chemical method the results of X-ray fluorescence analyses were more precise and accurate. Moreover it is possible to analyze precisely a little amount of the constituents such as SrO, Mn2O3 and P2O5 the analyses of which were very difficult using the wet chemical method.

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Analysis of the hazardous RoHS materials in polyethylene and polypropylene samples by bench-top and portable XRF methods (탁상형 및 휴대형 X-선 형광 분석기를 이용한 폴리에틸렌 및 폴리프로필렌 시료 중 RoHS 규제 물질의 비교 분석)

  • Choi, Soo-Jung;Kim, Chong-Hyeak;Lee, Sueg-Geun;Kang, In-Sung
    • Analytical Science and Technology
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    • v.23 no.1
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    • pp.74-82
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    • 2010
  • As a basic research for development of the domestic portable XRF spectrometer, we discussed the analytical results of bench-top and portable XRF methods for RoHS materials of the Cd, Pb, Hg, Cr(IV), polybrominated biphenyls(PBB) and polybrominated diphenyl ehters(PBDE). The instrumental parameters such as measurement time of bench-top and portable XRF were optimized using certified reference materials of polyethylene and polypropylene with 5 hazardous materials of 0~1,200 mg/kg. The quantitative analysis of total-Cr, total-Br, Cd, Hg and Pb in certified reference materials and plastic samples were compared by empirical method, fundamental parameter method of bench-top XRF and portable XRF.

Establishment of the Monoenergetic Fluorescent X-ray Radiation Fields (교정용 단일에너지 형광 X-선장의 제작)

  • Kim, Jang-Lyul;Kim, Bong-Hwan;Chang, Si-Young;Lee, Jae-Ki
    • Journal of Radiation Protection and Research
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    • v.23 no.1
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    • pp.33-47
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    • 1998
  • Using a combination of an X-ray generator Installed in radiation calibration laboratory of Korea Atomic Energy Research Institute (KAERI) and a series of 8 radiators and filters described in ISO-4037, monoenergetic fluorescent X-rays from 8.6 keV to 75 keV were produced. This fluorescent X-rays generated by primary X-rays from radiator were discriminated $K_{\beta}$ lines with the aid of filter material and the only $K_{\alpha}$ X-rays were analyzed with the high purity Ge detector and portable MCA. The air kerma rates were measured with the 35 co ionization chamber and compared with the calculational results, and the beam uniformity and the scattered effects of radiation fields were also measured. The beam purities were more than 90 % for the energy range of 8.6 keV to 75 keV and the air kerma rates were from 1.91 mGy/h (radiator : Au, filter : W) to 54.2 mGy (radiator : Mo, filter : Zr) at 43 cm from center of the radiator. The effective area of beam at the measurement point of air kerma rates was 12 cm ${\times}$ 12 cm and the influence of scattered radiation was less than 3 %. The fluorescent X-rays established in this study could be used for the determination of energy response of the radiation measurement devices and the personal dosemeters in low photon energy regions.

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X-Ray Fluorescence Analysis of Iron and Titanium in Iron Ores by Dilution Parameter Method (희석 파라미터법에 의한 철광석 중 철과 티탄의 X-선 형광분석)

  • Young Sang Kim;Lee Chong Wook
    • Journal of the Korean Chemical Society
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    • v.25 no.3
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    • pp.183-189
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    • 1981
  • Iron and titanium, the major constituents in iron ores, were X-ray spectrometrically determined by using the dilution parameter method. A standard and samples possessing a similar composition were diluted with the diluent $ZrO_2$ to their proper respective ratios. After measuring the intensity of the fluorescent X-ray, the dilution parameter was calculated from the following equation. $Pa=\frac{\frac{I_{as}}{(I_{as})_d}}{D-1}{^{-1}}$The dilution parameters were used to correct the difference between the matrix effect of the standard and that of the sample. The content of the major constituents was calculated, without using any standard calibration curves, from the following equation;$W_a=W_a^*{\cdot}{\frac{I_as}{I_{as}^*}{\cdot}\frac{P_a^*}{P_a}$where asterisks indicate the standard. The results agreed with those of the wet analysis within 2% of relative error, and the precision of the experiment was also tolerably good.

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Low-level Determinations of Uranium and Thorium in Geologic Samples by X-ray Fluorescence (x-선 형광분석기톨 이용한 지질시료 중 우라늄과 토륨의 미량분석)

  • Park, Yong Joon;Kim, Jung Suk;Choi, Kwang Soon;Suh, Moo Yul
    • Analytical Science and Technology
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    • v.9 no.1
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    • pp.20-25
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    • 1996
  • Trace levels of uranium and thorium in geologic samples are determined rapidly by a direct wavelength-dispersive X-ray fluorescence method. Relative intensity of scattered tube radiation was used as an internal standard to compensate for variations in instrumental operating characteristics. U and Th can be determined within a precision of ${\pm}10%$ and accuracy of ${\pm}15%$ or less with measuring times of 50 seconds for Th and 400 seconds for U, respectively. The results of XRF analysis were in good agreement with those of other methods such as nutron activation analysis and inductively coupled plasma atomic emission spectrometry.

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Fire Performance Testing Method for Fire Retardant EPS Sandwich Panel Using X-ray Analysis (X-선 분석법을 이용한 난연 EPS 샌드위치 패널의 화재성능평가 방법에 관한 연구)

  • Shim, Ji-Hun;Cho, Nam-Wook
    • Fire Science and Engineering
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    • v.29 no.6
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    • pp.76-83
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    • 2015
  • EPS sandwich panel contains flame retardants that slow down ignition during fires,reduce the amount of heat generated, and block the spread of combustion. However, if a sandwich panel does not satisfy standards for fire-retardant performance, it may increase damage to property and human life. It is difficult to test the fire-retardant performance of a finishing material with the naked eye, so it is necessary to develop convenient and fast evaluation methods that are convenient and fast. In this study, a fire safety evaluation method for EPS sandwich panel was analyzed using X-ray to detect specific components related to the fire-retardant performance X-ray fluorescence analysis (XRF) indicated that suitable panel products contained more aluminum in comparison to unsuitable products. Gibbsite was identified as the main crystalline material of flame retardant EPS through X-ray diffraction analysis (XRD) and was included in both suitable products and unsuitable products, but there was a difference in crystalline structure. This study was verifies the possibility of evaluating fire-retardant performance using ultimate analysis and crystal analysis through these X-ray methods.

A Study of Neolithic era Plain Coarse Pottery of Cheju Island by Mossbauer Spectroscopy (제주도 신석기 토기에 대한 Mossbauer 연구)

  • 윤태건;최원준;고정대;홍성락
    • Journal of the Korean Magnetics Society
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    • v.10 no.4
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    • pp.183-190
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    • 2000
  • This study aims at making a research into the physical and chemical properties of the neolithic era potterys, which are unearthed from Gosanli, Sagaeli, Bukchonli, Samyangdong and Gonaili districts in Cheju Island, by using X-ray diffraction, X-ray fluorescence spectrometer and Mossbauer spectroscopy. This results are as follows. The principal component of five plain coarse pottery sherds by X-ray fluorescence spectrometer and X-ray diffraction spectrum at the room temperature is silicate mineral which is equal to SiO$_2$, and they also have a little magetite, hematite and goethite. The most existent Fe is Fe$\^$+3/ through Mossbauer spectroscopy analysis of plain coarse pottery sherds and it is presumed that the magnetic hyperfine splitting caused this result. The ratio of Fe$\^$2+//(Fe$\^$2+/+Fe$\^$3+/) is mostly zero by Mossbauer spectrum at the room temperature of plain coarse pottery sherds and it is thought because they were fired in the atmosphere.

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