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射线照相绝对曝光时间应当为多少?
射线照相绝对曝光时间应当为多少?
表 2-9 源自参考文献 [2],其中列出了在不同厚度的钢材上使用不同辐射源进行射线照相时各种绝对曝光时间。 表 1-9 中两种型号胶片的相对曝光系数可见此表。
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