单选题

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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正确答案：A （备注：此答案有误）

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