X-ray Fluorescence Analysis of Rice and Rice Bran with a Dry Battery X-ray Generator

Ishii, Hideshi; Sato, Naoki; Kawano, Motonobu; Mesaki, Takamasa; Kawai, Jun

doi:10.2116/bunsekikagaku.54.321

Cited by 10 publications

(10 citation statements)

References 7 publications

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“…Radioisotopes, small air-cooled X-ray tubes, or pyroelectric X-ray emitters are used. [11][12][13][14][15][16][17][18][19] Terasawa found that the charge-up of an insulator produced X-rays. 20 He invented an X-ray device, as shown in Fig.…”

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A Simple X-Ray Emitter

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Energy-dispersive X-ray fluorescence (EDXRF) spectrometry is a well-established technique with high sensitivity for a wide range of elements. Recently, portable or handy EDXRF spectrometers have been developed for art, 1-4 archaeological, 5-7 environmental, [8][9][10] and forensic analyses. Radioisotopes, small air-cooled X-ray tubes, or pyroelectric X-ray emitters are used. [11][12][13][14][15][16][17][18][19] Terasawa found that the charge-up of an insulator produced X-rays. 20 He invented an X-ray device, as shown in Fig. 1, 21 where applying a high voltage on an insulator produced strong X-rays. Then, Kawai et al. 22 found that a vacuum of between 0.03 and 0.04 Torr was the best for X-ray emission. Brownridge 23 earlier proposed a pyroelectric insulator to produce X-rays, and many interesting phenomena were found for pyroelectric crystals. 24 In the present work, the X-ray generator proposed by Terasawa 20 was made and an independent verification of Terasawa is conducted. We measured X-ray spectra from the X-ray emitter and observed visible-light emission.Its correlation with the X-ray intensity was considered. ExperimentalA compact cylinder-type vacuum tube, a schematic illustration of which is shown in Fig. 2, with 20 mm radius and 50 mm height was made. A photo is shown in Fig. 3, left. The cylinder body was polypropylene, made of a medical disposal syringe. The top and bottom were made of brass. Teflon as an insulator was fixed between the needle-shaped copper electrode and a plate electrode with a spring. The cylinder was roughly evacuated (about 6 Pa = 0.04 Torr) by a rotary pump and a high voltage was applied from 1500 to 2900 V by a DC power supply. The bottom brass was grounded, and to a feedthrough electrode was applied a minus high voltage. In the present paper we assign a high voltage, such as 1500 V, but this means that the feedthrough was applied -1500 V, and the bottom brass was grounded. We also tried that a high voltage was applied between the top brass and the feedthrough; this way of producing an electric field also produced high intensity X-rays. The vacuum of the cylinder was adjusted by a valve between the rotary pump and the X-ray cylinder, to be 6 Pa, which was suitable for the strongest X-ray emission, according to Ref. 22. The X-rays were emitted through a 150 µm thick beryllium window. The profiles of the measured X-ray spectra with the applied voltages of 1800 V, 2000 V and 2400 V were as follows: (1) The peak positions were 1.71, 1.79, and 1.86 keV, respectively. (2) The higher energy side edges of the spectra were 1.97, 2.14, and 2.54 keV, respectively. Above these energies, the spectra became zero counts. The spectra were weak, but similar to those measured by a glass cylinder X-ray tube described below.The X-ray spectra shifted to higher energy as the applied voltage became higher. During X-ray emission, a moving visible light emitting phenomenon was observed inside the cylinder, as shown in Fig. 4, where three representative patterns of light emission are pictured. The light ...

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“…. The sensitivity difference in transition metals, environmental, and rice analyses has been reported after the publication of Ref …”

Section: X‐ray Fluorescence Analysismentioning

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“…2. The sensitivity difference in transition metals, [10] environmental, [11] and rice analyses [12] has been reported after the publication of Ref. [9] .The authors have also used the pyroelectric X-ray generator for the X-ray absorption spectrometry using an Si-PIN detector [13] and a superconducting energy dispersive X-ray detector.…”

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Pyroelectric X‐ray application to X‐ray absorption and emission spectroscopies

2012

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Pyroelectric X‐ray generator of Amptek Inc. was used for X‐ray absorption spectroscopy as well as X‐ray fluorescence analysis. The white X‐ray radiation from the pyroelectric crystal was used for X‐ray absorption measurement by using an Si‐PIN X‐ray detector. X‐ray absorption K‐edge spectra of transition metal thin films could be measured. The X‐ray fluorescence analysis was possible down to 0.1 ppm concentrations of transition metal water solutions after preconcentrations. The electric battery‐driven pyroelectric X‐ray generator was possible for practical chemical analysis. Copyright © 2012 John Wiley & Sons, Ltd.

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“…Although several wet chemical analysis methods of fluorine in the slags were proposed, none of them could provide the reliable results. [9,10] Given the importance of AOD slags containing CaF 2 , it became necessary to establish routine instrumental techniques to produce accurate and precise analytical results for process control. Over a number of years, X-ray fluorescence (XRF) spectrometry has been widely employed as a routine instrumental analysis technique for quantifying minerals, slags, oxides, etc.…”

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Chemical analysis of argon-oxygen decarburization slags in stainless steelmaking process by X-ray fluorescence spectrometry

2010

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A quantitative analysis method of fluorine in the slags produced in the stainless argon-oxygen decarburization (AOD) process by X-ray spectrometry was proposed employing direct analysis technique by pressed pellet. This research investigated the separate quantification of calcium fluoride and calcium oxide contained in AOD slags. X-ray diffraction measurement was performed to identify the stable phase of fluorine compound, which is primarily present in the slags. The synthetic standards prepared in laboratory were used to construct the X-ray fluorescence (XRF) calibration curves for F, Ca t O, SiO 2 , MgO, Al 2 O 3 and Cr 2 O 3 , considering the matrix effects and line overlap corrections (t: total). The calibration curves were tested by the quantitative analysis of synthetic standards with satisfactory precision and accuracy. The proposed method might be an alternative solution to the problem with the simple and routine chemical analyses of calcium fluoride in AOD slags of stainless steelmaking process by XRF spectrometry.

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X-ray Fluorescence Analysis of Rice and Rice Bran with a Dry Battery X-ray Generator

Cited by 10 publications

References 7 publications

A Simple X-Ray Emitter

A Simple X-Ray Emitter

Pyroelectric X‐ray application to X‐ray absorption and emission spectroscopies

Chemical analysis of argon-oxygen decarburization slags in stainless steelmaking process by X-ray fluorescence spectrometry

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