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首页> 外文期刊>International journal of mass spectrometry >Application of a continuous heating method using thermal ionization mass spectrometry to measure isotope ratios of plutonium and uranium in trace amounts of uranium-plutonium mixture sample
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Application of a continuous heating method using thermal ionization mass spectrometry to measure isotope ratios of plutonium and uranium in trace amounts of uranium-plutonium mixture sample

机译：应用热电离质谱法连续加热法测量痕量铀-混合物样品中p和铀的同位素比

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摘要

A method for measuring isotope ratios of plutonium and uranium in plutonium or uranium-plutonium (Pu/U) mixture samples was developed by using a continuous heating method of thermal ionization mass spectrometry, which was previously shown to be effective in measuring isotope ratios of trace uranium. In this method, temperature of an evaporation filament is increased sequentially. This leads to measure the ratios of Pu and U at different temperatures in which each element is evaporated efficiently. Under optimal measurement conditions, the intensity of ~(239)Pu and the ratio of ~(240)Pu/ ~(239)Pu were measured down to sample amounts of 0.1 fg and 0.3 fg, respectively. In Pu/U mixture samples with pg-level masses and 0.01-10 Pu/U ratios, isotope ratios of ~(240)Pu/ ~(239)Pu and ~(235)U/ ~(238)U were measured simultaneously without chemical separation of samples. The relative standard deviation of the isotope ratios of ~(240)Pu/~(239)Pu and ~(235)U/ ~(238)U in the sample containing each 1 pg of plutonium and uranium were better than 2% and 4%, respectively. Moreover, ~(238)Pu/ ~(239)Pu ratios were obtained by using a correction in which the ~(238)U intensity was estimated from the ~(235)U intensity and the ~(235)U/ ~(238)U ratio. The results in this study suggest that the continuous heating method of thermal ionization mass spectrometry will be effective tool as a method for measuring isotope ratios in the Pu/U mixture samples.
机译：通过使用热电离质谱的连续加热方法，开发了一种测定p或铀-lu（Pu / U）混合物样品中p和铀同位素比的方法，该方法先前已证明可有效地测量痕量同位素比铀。在该方法中，蒸发丝的温度依次升高。这导致测量在不同温度下Pu和U的比率，在该温度下每种元素均被有效蒸发。在最佳测量条件下，分别测量〜（239）Pu的强度和〜（240）Pu /〜（239）Pu的比值，分别降至0.1 fg和0.3 fg的样品量。在具有pg级质量和0.01-10 Pu / U比的Pu / U混合物样品中，同时测量了〜（240）Pu /〜（239）Pu和〜（235）U /〜（238）U的同位素比样品的化学分离。 1和铀各1 pg的样品中〜（240）Pu /〜（239）Pu和〜（235）U /〜（238）U同位素比的相对标准偏差分别优于2％和4 ％， 分别。此外，通过使用一种校正方法获得了〜（238）Pu /〜（239）Pu比率，其中根据〜（235）U强度和〜（235）U /〜（238）估算〜（238）U强度。 U比这项研究的结果表明，热电离质谱法的连续加热方法将成为测量Pu / U混合物样品中同位素比的有效工具。

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