The code(Api 1104)specifies that 1 iqi is to be placed in the approximate center and 1 at the end of the FILM to be inspected (in od exceeding 5"). My guess is that the reason for the placement to be in the center of the film is due to fact that the source to film distance is the greatest in the center.My question is in a scenario where you would be using multiple sheets of film (overlapping) to cover a specific view, would you place the iqi in the center of the view (the overlapped area in a 2 sheet view) or in the center of each individual sheet of film? To me in this situation to place the iqi in centers of the film and not in the center of the view would contradict the principle of the iqi being in the area where the sensitivity is most important.
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