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Radiography for Building Renovation
Figure 1-5
Figure 1 — A typical exposure geometry; x indicates those areas not imaged.
Figure 2 — Schematic illustration of calculating actual film size: given a source to film distance of 1.2 m (48 in.) and a source to object distance of 1 m (40 in.), one divides 1 by 1.2, which results in 0.83 as the correction factor. Multiplying the correction factor by the dimensions of the physical film (356 by 432 mm [14 by 17 in.]) gives an actual usable film size of 295 by 359 mm (11.6 by 14.1 in.).
Figure 3 — Schematic illustrating degree of shift parameters.
Figure 4 — Difference in shift between larger and shorter source to film distances.
Figure 5 — An alternative technique for depth determination where floor thickness need not be initially known.
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