著者

高島 教一郎 河口 広司 中島 篤之助

出版者

社団法人 日本分光学会

雑誌

分光研究 (ISSN:00387002)

巻号頁・発行日

vol.11, no.1, pp.14-19, 1962

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The evaporation method developed by Mandel' shtam and Zaidel is applied for the determination of impurity elements in uranium oxide.For the evaporation of impurity elements, most favorable sam-ple temperature, duration of heating, sample weight, and gap length between a collector electrode and a crucible are chosen.Calibration curves for the determination of Fe, Cr, Mn, Ni, Cu, B, Si, P and Cd are prepared.In the analyses of B and Cd, AgCl is added to uranium oxide (1%) as a carrier before evaporation and a d.c.arc excitation (10A) is used in the spectrographic procedure.Though the repeatability of analytical results is 10% or so for each element, the values determined for Fe and Ni are considerably deviated from the values obtained by the carrier-distillation method and chemical analysis.The evaporation rate is measured as a function of evaporation temperature for Sb, Fe and Cd by the use of radioactive tracers <SUP>124</SUP>Sb, <SUP>59</SUP>Fe and <SUP>115m</SUP>Cd respectively.

著者

中島 篤之助 高橋 正雄 河口 広司

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.22, no.11, pp.564-568, 1958

被引用文献数

1

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A method has been developed for the determination of rare earth elements including yttrium in uranium and its compounds. The greater portion of the uranium is separated from the rare earths by ether extraction. The rare earths are then precipitated as fluorides and subsequently purified as hydroxides. Lanthanum was used as the carrier. The efficiency of the above separation procedures was studied by means of the radioactive tracer Eu<SUP>152+154</SUP>. The final determination was carried out spectrographically by the copper-spark method. Five rare earth elements which showed extremely high neutron absorption were investigated, and their limits of detection (sensitivity) and recoveries from U<SUB>3</SUB>O<SUB>8</SUB> are reported.

著者

高島 教一郎 中島 篤之助 河口 広司 大内 義彦

出版者

社団法人 日本分光学会

雑誌

分光研究 (ISSN:00387002)

巻号頁・発行日

vol.18, no.5, pp.262-267, 1969

被引用文献数

5

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A direct, quantitative analytical technique for the analysis of gadolinium, dysprosium, europium and samarium in aluminum oxide using the X-ray-excited optical fluorescence spectra is described.<BR>Rare earth elements were coprecipitated with host aluminum from acid solution as aluminum hydroxide. Precipitated hydroxide was dried after centrifugal separation and then heated in a muffle furnace at 1000&deg;C for 2 hours. These oxides were then heated at 1450&deg;C in an electric resistance furnace for 60 seconds.<BR>Such an impulsive heating followed by quenching, described above, prominently enhances the luminescent intensities of rare earth elements. It was shown by the X-ray diffraction method that the crystal of Al<SUB>2</SUB>O<SUB>3</SUB> were transformed from &gamma;r-type oxide to the stable &alpha;-type oxide during the above heat treatment.<BR>Concentrations of gadolinium, dysprosium, samarium, europium have been determined by this method with detection limits ranging from 0.05 to 1.0ppm. Reproducibility was found to be 5-10%.The enhancement and suppression effect due to iron, silicon and copper were investigated and discussed.