TM 5-805-12
Table 2. Minimum shielding requirements for fluoroscopic x-ray facilities.
WT in mΑ-min/week
1
DISTANCE IN FEET (METERS) FROM SOURCE (X-RAY TUBE TARGET) TO OCCUPIED AREA
100 kVp
125 kVp
150 kVp
2000
800
400
5
7
10
14
20
28
40
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
(8.4)
(12.2)
1000
400
200
5
7
10
14
20
28
40
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
(8.4)
(12.2)
500
200
100
5
7
10
14 20
28
28
40
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
(8.4)
(12.2)
250
100
50
5
7
10
14
20
28
40
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
(8.4)
(12.2)
125
50
25
5
7
10
14
20
28
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
(8.4)
40
62.5
25
12.5
5
7
10
14
20
(12.2)
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
28
31
12
6
5
7
10
14
(8.4)
(1.5)
(2.1)
(3.0)
(4.2)
20
(6.1)
AREA TYPE
MATERIAL
SECONDARY BARRIER THICKNESS
CONTROLLED
LEAD, mm
0.75
0.6
0.45
0.35
0.3
0.05
0
0
0
0
0
NONCONTROL..
LEAD, mm
1.6
1.3
1.05
0.75
0.6
0.45
0.4
0.25
0.25
0
0
CONTROLLED
CONC., cm
7.5
5.5
4
3
2.5
0.5
0
0
0
0
0
NONCONTROL.
CONC., cm
14
12
10
8
6
4.5
3.5
2.5
2.5
0.5
0
0
W - Workload in mA-minweek, T - occupancy factor.
Source: Management and control of Diagnostic X-Ray. Therapeutic X-ray. and Gamma-Beam equipment
TB MED 521.
1-4
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