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 22.5
1.6 Ci Cs-137
1.0 Ci Cs-137
20.0
.09 mR/hr
0.15 mR/hr
150'
5.0
0.17 mR/hr
0.28 mR/hr
100'
0.43 mR/hr
0.69 mR/hr
50'
0.72 mR/hr
1.16 mR/hr
30'
14'
1.45 mR/hr
2.32 mR/hr
10'
0'
EXCLUSION ZONE UNDER
U.S. REGULATIONS
DETECTOR TRACK
SOURCE TRACK
5'
100'
Figure 7.8 VACIS II - Gamma Ray
Imaging System Exclusion Zones
NOTE: EXCLUSION ZONE PERIMETER SHOWN FOR TYPICAL U.S. INSTALLATION
FOR 1.6 Ci SOURCE AT 2.0 mR/hr LIMIT.
Cesium Source with and without
Shielding Wall
(Courtesy of Science Applications
International Corporation, Inc.)
22.5
5.0
1.0 Ci Cs-137
1.6 Ci Cs-137
0.004 mR/hr
0.007 mR/hr
40'
0.006 mR/hr
0.009 mR/hr
30'
0.007 mR/hr
0.012 mR/hr
20'
0.010 mR/hr
0.016 mR/hr
10'
CONCRETE WALL
12" THICK x 8' HIGH
0'
EXCLUSION ZONE UNDER
10'
DETECTOR TRACK
U.S. REGULATIONS
SOURCE TRACK
5'
100'
NOTE: Value at wall rear for 1.0 Ci Cs source is 0.015 mR/hr.
Value at wall rear for 1.6 Ci Cs source is 0.023 mR/hr.
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