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Approximate Radiographic Equivalence Factors
Based on Energy Level

 

METAL
100 kV
150 kV
200 kV
250 kV
400 kV

1
MeV

IR 192
CO 60
Magnesium
0.05
0.05
0.08
-
-
-
-
-
Aluminum (pure)
0.08
0.12
0.18
-
-
-
0.35
0.35
Aluminum Alloy
0.10
0.14
0.18
-
-
-
0.35
0.35
Titanium
-
0.40
0.35
-
0.71
0.9
0.9
0.9
Iron/All Steels
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Copper
1.5
1.6
1.4
1.4
1.4
1.1
1.1
1.1
Zinc
-
1.4
1.3
-
1.3
-
1.1
1.0
Brass*
-
1.9
1.8
1.6
1.3
1.2
1.1
1.0
Inconel Xb
-
1.4
1.3
-
1.3
1.3
1.3
1.3
Monel
1.7
-
1.2
-
-
-
-
-
Zirconium
2.4
2.3
2.0
1.7
1.5
1.0
1.2
1.0
Lead
14.0
14.0
12.0
-
-
5.0
4.0
2.3
Uranium
-
-
20.0
16.0
12.0
4.0
12.6
3.4
* The values for brass will change if tin or lead is included in the alloy.