摘要: 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100 m，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 several β-ray stopping layers on the BIXS method, in this paper, 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 best β-ray stopping layer in the BIXS method.