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The properly exposed radiograph was obtained for an aluminum weld 1 inch thick with the source...

The properly exposed radiograph was obtained for an aluminum weld 1 inch thick with

the source 60 inches from the film. The geometric unsharpness, however, was found to be

unsatisfactory and source-to film distance was increased to 120 in. What would be a

proper exposure time for this new placement, compared to the original exposure time T0 ?

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