无限厚度和吸收限的概念： 1） 无限厚度（Infinite Thickness）： 上节已提到，当X 射线穿透物质时其强度要发生减弱，其减弱的程度和入射波长，吸收介质的原子序数 及其密度和厚度有关。
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fission source of infinite thickness 无限厚裂变源
critical thickness of infinite slab 无限﹞平板临界厚度
infinite optical thickness 无限光学厚度
To the problem of analyzing the stability of veneer cover soil of equal thickness, the most commonly used methods are based on the assumption that slopes were infinite in length.
对于等厚式封面土层，目前常用无限长的平行坡方法进行稳定性分析。
Taking the infinite plate for instance, the distribution of electric field in full space is solved and detection-thickness ratio is presented to discuss the limit of advanced detection.
以无限大板状体为例求解全空间电场分布，提出探厚比概念以讨论超前探测极限问题。
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