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 an extensive application in the study of fusion reactor and nuclear technology.β-decay induced X-ray spectroscopy (BIXS ) is a nondestructive tritium analysis technique, and it can detect deeper tritium distributions (～0.1 mm and ～1 mm for high-Z materials and low-Z materials, respectively). In the BIXS method, a metal film as β-ray stopping layer has advantages of eliminating the interference of polarizational bremsstrahlung and reducing the detector’s signal pile-up. In order to study the effect of severalβ-ray stopping layers on the BIXS method, we use the Monte Carlo code PENELOPE to simulate the BIXS experiments using Al, Au metal films and Ar gas as the β-ray stopping layers, and then use the regularization method to calculate and compare the results. In this paper, we also discuss the effects of accuracy of X-ray yield and bremsstrahlung spectrum incline on the BIXS method. The study in this paper indicates that the Al film is the bestβ-ray stopping layer in the BIXS method.
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