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首页> 外文期刊>Mass Spectrometry Letters >A Technique to Minimize Impurity Signal from Blank Rhenium Filaments for Highly Accurate TIMS Measurements of Uranium in Ultra-Trace Levels
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A Technique to Minimize Impurity Signal from Blank Rhenium Filaments for Highly Accurate TIMS Measurements of Uranium in Ultra-Trace Levels

机译：最小化空白Blank丝中杂质信号的技术，用于超痕量铀的高精度TIMS测量

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As background significantly affects measurement accuracy and a detection limit in determination of the trace amounts of uranium, it is necessary to minimize the impurities in the filaments used for thermal ionization mass spectrometry (TIMS). We have varied the degassing condition such as the heating currents and duration times to reduce the backgrounds from the filaments prepared with zone-refined rhenium tape. The most efficient degassing condition of the heating current and the duration time was determined as 3.5 A and 60 min, respectively. The TIMS measurement combined with the isotope dilution mass spectrometry (IDMS) technique showed that the uranium backgrounds were determined to be in a few fg level from blank rhenium filaments. The background minimized filaments were utilized to measure the uranium isotope ratios of a U030 (NIST) standard sample. The excellent agreement of the measurement with the certified isotope ratios showed that the degassing procedure optimized in this study efficiently reduced the impurity signals of uranium from blank rhenium filaments to a negligible level.
机译：由于本底会显着影响测量精度以及铀的痕量测定中的检测极限，因此有必要将用于热电离质谱（TIMS）的灯丝中的杂质减至最少。我们已经改变了脱气条件，例如加热电流和持续时间，以减少用区域精制tape带制备的长丝的背景。确定加热电流和持续时间的最有效脱气条件分别为3.5 A和60分钟。 TIMS测量与同位素稀释质谱法（IDMS）结合显示，从空白的filament丝中可以确定铀背景处于几fg的水平。背景最小化的灯丝用于测量U030（NIST）标准样品的铀同位素比。测量结果与标准同位素比值的极佳一致性表明，本研究中优化的脱气程序有效地将了空白blank丝中铀的杂质信号降低到可以忽略的水平。

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