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Q. |
The approximate radiographic equivalence factors for steel and copper at 220 kV are 1.0 and 1.4 respectively. If it is desirable to radiograph a 1.27 cm (0.5 inch) piece of copper, what thickness of steel would require about the same exposure characteristics? |
A. | 1.78 cm (0.7 inches) |
B. | 0.9 cm (0.35 inches) |
C. | 3.55 cm (1.4 inches) |
D. | 2.54 cm (1.0 inch) |
Answer» A. 1.78 cm (0.7 inches) |
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