Volume 2 - Atomic Energy Regulatory Board

TABLE-1 : EFFECTIVE FOCAL SPOT SIZE FOR
A MAGNIFICATION OF 4/3
Smallest group
resolved
1
2
3
4
5
6
7
8
9
10
11
12
lp/mm
0.84
1.00
1.19
1.14
1.68
2.00
2.38
2.83
3.36
4.00
4.76
5.66
Effective focal spot size
(mm)
4.3
3.7
3.1
2.6
2.2
1.8
1.5
1.3
1.1
0.9
0.8
0.7
TABLE 2 : HVT AS A FUNCTION OF FILTRATION AND TUBE
POTENTIAL (SINGLE PHASE GENERATORS)
Total
filtration
(mm Al)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Peak potential (kV)
30 40 50 60 70 80 90 100 110 120
Half Value Thickness (mm Al)
0.36 0.47 0.58 0.67 0.76 0.84 0.92 1.00 1.08 1.16
0.55 0.78 0.95 1.08 1.21 1.33 1.46 1.58 1.70 1.82
0.78 1.04 1.25 1.42 1.59 1.75 1.90 2.08 2.25 2.42
0.92 1.22 1.49 1.70 1.90 2.10 2.28 2.48 2.70 2.90
1.02 1.38 1.69 1.95 2.16 2.37 2.58 2.82 3.06 3.30
1.49 1.87 2.16 2.40 2.62 2.86 3.12 3.38 3.65
1.58 2.00 2.34 2.60 2.86 3.12 3.40 3.68 3.95
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