Energy deposition portions in the paired air slabs for the mammography X-ray beams
|Location of the paired air slabs||Energy deposition portion (%)|
|Lower slab (mm)||Beam code|
The air slabs were piled symmetrically with the beam axis plane placed 35-mm-high from the collector electrode as a symmetry plane. The low-energy mammography X-ray beams were incident on the front face of the air box (see Fig. 4). The number appearing in the beam code indicated the high voltage loaded on the X-ray tube with a molybdenum anode. The added filtration was 0.03 mm molybdenum, and the inherent filtration was 1 mm beryllium.