TM 5-805-12
Table 1. Minimum shielding requirements for radiographic x-ray facilities.
WUT in mΑ-min/week
1
DISTANCE IN FEET (METERS) FROM SOURCE (X-RAY TUBE TARGET) TO OCCUPIED AREA
100 kVp
125 kVp
150 kVp
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
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
40
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
(8.4)
(12.2)
62.5
25
12.5
5
7
10
14
20
28
40
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
(8.4)
(12.2)
31
12
6
5
7
10
14
20
28
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
(8.4)
15
6
3
5
7
10
14
20
(1.5)
(2.1)
(3.0)
(4.2)
(6.1)
4
AREA TYPE
MATERIAL
PRIMARY BARRIER THICKNESS
2
CONTROLLED
LEAD, mm
1.95
1.65
1.4
1.15
0.9
0.65
0.45
0.3
0.2
0.1
0.1
2
NONCONTROL.
LEAD, mm
2.9
2.6
2.3
2.65
1.75
1.5
1.2
0.95
0.75
0.55
0.35
3
CONTROLLED
CONC., cm
18
15.5
13.5
11.5
9.5
7
5.5
4
2.5
1.5
0.5
3
NONCONTROL.
CONC., cm
25
23
20.5
18.5
16.5
14
12
10
8
6
4
4
SECONDARY BARRIER THICKNESS
2
CONTROLLED
LEAD, mm
0.55
0.45
0.35
0.3
0
0
0
0
0
0
0
2
NONCONTROL.
LEAD, mm
1.3
1.05
0.75
0.55
0.45
0.35
0.3
0
0
0
3
CONTROLLED
CONC., cm
5
3.5
2.5
2
0
0
0
0
0
0
0
3
NONCONTROL.
CONC., cm
11.5
9.5
7.5
5.5
4
3
2
0.5
0
0
0
1
W - Workload in mA-min/week, U - use factor, T - occupancy factor.
2
See table 4 for conversion of thickness in millimeters to inches.
3
Thickness based on concrete density of 2.35 g/cm3 (147 lb/ft3).
4
Barrier thickness based on a peak tube potential of 150 kVp.
Source: Management and control of Diagnostic X-Ray, Therapeutic X-ray, and Gamma-Beam equipment,
TB MID 521.
1-3
Previous Page
