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首页> 外文会议>International Conference on Advances in Destructive and Non-Destructive Analysis for Environmental Monitoring and Nuclear Forensics; 20021021-20021023; Karlsruhe; DE >ENHANCED IONIZATION EFFICIENCY USING THE HIGH EFFICIENCY CAVITY SOURCE IMPLEMENTED ON A MAGNETIC SECTOR TIMS
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ENHANCED IONIZATION EFFICIENCY USING THE HIGH EFFICIENCY CAVITY SOURCE IMPLEMENTED ON A MAGNETIC SECTOR TIMS

机译：通过在磁扇形TIMS上实现的高效空穴源来增强电离效率

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摘要

Traditional thermal ionization mass spectrometry (TIMS) is the most common method for determination of isotope ratios and concentration (via isotope dilution) of uranium and plutonium. Despite its exemplary performance, the thermal ionization mechanism is inefficient. Total efficiencies (the ratio of ions detected/atoms of sample loaded) are typically of the order of 0.001 to 0.1% for uranium and 0.1 to 1% for plutonium; most of the available material is lost during analysis. With the goal of improving total efficiency for analysing uranium and plutonium by TIMS, a new cavity type ion source was developed and installed on a commercial magnetic sector mass spectrometer. The dimensions and geometry of this high efficiency cavity source (HECS) combine to provide a dramatic increase in ionization efficiency and, therefore, in sample utilization. Average ionization efficiencies for the new source were 5% for uranium and 7% for plutonium. Implementation of the HECS could significantly improve detection of uranium and plutonium in safeguards and environmental sampling programmes, in addition to having applications in other arenas where high sample utilization efficiency is critical.
机译：传统的热电离质谱法（TIMS）是确定铀和p的同位素比和浓度（通过同位素稀释）的最常用方法。尽管其具有示范性的性能，但热电离机理仍然无效。总效率（检测到的离子/负载的样品的原子之比）对于铀通常约为0.001％至0.1％，对于0.1而言约为0.1％至1％。在分析过程中，大多数可用材料都会丢失。为了提高通过TIMS分析铀和p的总效率，开发了一种新的腔型离子源并将其安装在商用磁性扇形质谱仪上。这种高效腔源（HECS）的尺寸和几何形状相结合，极大地提高了电离效率，从而大大提高了样品利用率。新来源的平均电离效率对铀来说是5％，对p来说是7％。 HECS的实施，除了可以在其他要求高样品利用率的领域中应用外，还可以大大改善保障措施和环境采样计划中铀和p的检测。

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