The Design of Diagnostic Medical Facilities where ... - ResearchGate

It should be noted that below 100 kVp, transmission is similar for both primary and secondary radiation.
Table C.3 provides values for secondary radiation transmission through concrete for 100‐150 kVp.
Table C.3: Transmission and lead equivalent thickness of concrete (2350 kg/m 3 ) for secondary
radiation 100–150 kVp.
100 kVp 125 kVp 150 kVp
Lead (mm) Transmission Concrete (mm) Transmission Concrete (mm) Transmission Concrete (mm)
2.0 7.8E-4 128 1.5E-3 142 2.8E-3 157
2.24
(Code 5)
2.65
(Code 6)
4.3E-4 143 8.7E-4 157 1.8E-3 171
1.5E-4 168 3.4E-4 192 8.1E-4 186
3.0 6.3E-5 190 1.6E-4 204 4.2E-4 216
3.15
(Code 7)
3.55
(Code 8)
4.3E-5 199 1.1E-4 213 3.2E-4 224
1.6E-5 225 4.6E-5 238 1.5E-4 247
4.0 5.1E-6 253 1.7E-5 265 6.7E-5 272
Table C.4: Lead equivalent thickness for standard size concrete blocks (density 2350 kg/m 3 )
Lead thickness (mm)
Concrete thickness (mm)
Primary and Secondary Primary Secondary
kVp: 30 50 75 100 125 150 100 125 150
100 0.8 1.0 1.1 1.5 1.2 0.9 1.5 1.3 1.1
215 1.8 2.2 2.3 3.4 2.9 2.4 3.4 3.2 3
The Design of Diagnostic Medical Facilities where Ionising Radiation is used 93