The dentists new X-ray machine has inherent filtration of 2 mm of aluminum. The dentist is operating the X-ray machine above 70 KVp for diagnostic film. Which of the following amounts of added filtration will be necessary to meet the minimum filtration required?
A 1.5 mm aluminum
B 0.5 mm aluminum
C 2.5 mm aluminum
D 2.0 mm aluminum
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