用国产x光底片不经预曝光时，无图象出现，经预曝光则有图象出现(见图1)，用进口x光底片未经预曝光者，图象的暗线区别不大(见图2)。预曝光后的x光底片显示出暗线深浅不同的正确图象(见图3)。国产x光底片与进口x光底片比较，国产片敏感性较低，预曝后的x光底片上出现的暗线普遍较浅且细，PBPI。不可见。
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