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氚分析在聚变堆与核技术的研究中有着广泛的应用。BIXS技术(β衰变诱发X射线谱技术)是一项无损的氚分析技术,该技术的分析深度对于高原子序数的材料能达到100μm,对低原子序数的材料能达到1 mm。在BIXS技术中,采用金属薄膜作为β射线阻挡层具有排除极化韧致辐射干扰、减少探测器信号堆积等优点。为了研究多种β射线阻挡层材料对BIXS技术的影响,利用Monte Carlo方法 PENELOPE并行模拟程序分别模拟了采用Al、Au金属薄膜和Ar气作为β射线阻挡层的BIXS技术,并使用GENEREG反演程序对模拟结果进行反演计算及比较。还讨论了韧致辐射与特征X射线产额计算精度、韧致辐射谱倾斜对BIXS技术的影响。研究表明Al金属薄膜最适合用作BIXS技术的β射线阻挡层。
Tritium analysis has a wide range of applications in the research of fusion reactor and nuclear technology. The BIXS technique (β-decay-induced X-ray spectroscopy) is a non-destructive tritium analysis technique that can be analyzed to a depth of 100 μm for high atomic number materials and 1 mm for low atomic number materials. In the BIXS technology, the use of a metal thin film as a β-ray blocking layer has the advantage of eliminating polarization bremsstrahlung interference and reducing detector signal accumulation. In order to study the influence of many kinds of β-ray blocking materials on BIXS technology, the BIXS technique using Al, Au metal film and Ar gas as the β-ray blocking layer was simulated respectively by the Monte Carlo method PENELOPE parallel simulation program and the GENEREG inversion program The inversion and calculation of the simulation results are compared. The effects of bremsstrahlung and characteristic X-ray yield calculation accuracy and bremsstrahlung spectral tilt on BIXS technology are also discussed. Studies have shown that Al metal films are most suitable for use as beta-ray barriers for BIXS technology.