Progress in Medical Physics

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Table. 1.

Table. 1.

Energy deposition portions in the paired air slabs for the low-energy X-ray beams of BIPM quality

Location of the paired air slabs Energy deposition portion (%)


Upper slab (mm) Lower slab (mm) Beam code


BIPM10 BIPM30 BIPM25 BIPM50b BIPM50a
35–40 30–35 98.87 93.81 93.06 79.56 65.88
40–45 25–30 1.07 6.01 6.85 17.01 23.91
45–50 20–25 0.02 0.14 0.07 2.72 7.50
50–55 15–20 0.01 0.01 0.01 0.55 2.06
55–60 10–15 0.01 0.01 0.01 0.12 0.51
60–65 5–10 0.01 0.01 0.00 0.03 0.11
65–70 0–5 0.00 0.00 0.00 0.01 0.03

BIPM, Bureau International des Poids et Mesures.

The air slabs were piled symmetrically with the beam axis plane placed 35-mm-high from the collector electrode as the symmetry plane. The low-energy X-ray beams of BIPM quality were incident on the front face of the air box (see Fig. 4) and the beam size was 10-mm in diameter. The lengths and widths of the slabs were the same as those of the collector electrode, 15.8 mm and 70.0 mm, respectively.

Progress in Medical Physics 2022;33:1-9 https://doi.org/10.14316/pmp.2022.33.1.1
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