For an x-ray beam operated at 90 kVp, the required minimum filtration must be
a. 0.7 mm Al/Eq inherent plus 1.0 mm Al/Eq added.
b. 1.0 mm Al/Eq inherent plus 1.5 mm Al/Eq added.
c. 0.5 mm Al/Eq inherent plus 1.0 mm Al/Eq added.
d. none of the above
b. 1.0 mm Al/Eq inherent plus 1.5 mm Al/Eq added.
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Fill in the blank(s) with the appropriate word(s).
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