Sentinel projetor Operating And Maintenance Manual page 7

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Isotope Assembly
Model Number
Ytterbium-169 91810
Selenium-75 A424-25W
Iridium-192 A424-9
Cobalt-60 A424-19
Cesium-137 A424-30
Model 880 Omega authorized contents
Isotope Assembly
Model Number
Ytterbium-169 91810
Selenium-75 A424-25W
Iridium-192 A424-9
Source output
Isotope At 1 m per Ci (37 GBq)
Ytterbium-169 0.125 R/hr
Selenium-75 0.203 R/hr
Iridium-192 0.48 R/hr
Cobalt-60 1.30 R/hr
Cesium-137 0.32 R/hr
Selected attenuation data
Material Approximate
Material
Density
3
(g/cm )
Concrete 2.35
Aluminum 2.65
Steel 7.80
Lead 11.34
Tungsten 17.80
DU 18.70
Operating Distance
The distance between the remote control and the exposure head is determined by summing the length of
the remote control conduits plus the total length of source guide tubes used, and normally should not
exceed 47 ft (14.2 m) with standard 25 ft. controls.
Standard remote controls:
25 ft (7.6 m), 35 ft (10.7 m), 50 ft (15 m)
Standard source guide tubes (projection sheaths):
7 ft (2.1 m) set of three source guide tubes: 21 ft total (6.3 m)
Gamma Half Life
Energy Range
8-308 keV 32 days
66-401 keV 120 days
206-612 keV 74 days
1.17-1.33 MeV 5.27 years
663 keV 30 years
Gamma Half Life
Energy Range
8-308 keV 32 days
66-401 keV 120 days
206-612 keV 74 days
1.25 mSv/hr 1.3 R/hr
2.03 mSv/hr 2.2 R/hr
4.80 mSv/hr 5.2 R/hr
13.0 mSv/hr 14.0 R/hr
3.20 mSv/hr 3.4 R/hr
Approximate Half Value Thickness
Ytterbium-169 Selenium-75
1.140 (29.0) 1.180 (30.0)
- 1.100 (27.0)
0.170 (4.3) 0.315 (8.0)
0.032 (0.8) 0.039 (1.0)
- 0.032 (0.8)
- -
1.3
TECHNICAL SPECIFICATIONS
Approximate
Steel Working
Thickness
2-20 mm
3-29 mm
12-63 mm
50-150 mm
12-63 mm
Approximate
Steel Working
Thickness
2-20 mm
3-29 mm
12-63 mm
At 1 ft per Ci (37 GBq)
13.0 mSv/hr
22.0 mSv/hr
52.0 mSv/hr
140 mSv/hr
34.0 mSv/hr
Inches (mm)
Iridium-192 Cobalt-60
1.700 (43.2) 2.400 (61.0)
- -
0.512 (13.0) 0.827 (21.0)
0.200 (5.1) 0.500 (12.7)
0.130 (3.3) 0.310 (7.9)
0.050 (1.3) 0.270 (6.8)
Device/Source
Maximum
Capacity
20 Ci 0.74 TBq
150 Ci 5.55 TBq
50 Ci 4.81 TBq
25 mCi 925 MBq
380 mCi 14.0 GBq
Device/Source
Maximum
Capacity
30 Ci 1.11 TBq
80 Ci 2.96 TBq
15 Ci 0.55 TBq
Cesium-137
3.00 (76.2)
-
0.900 (22.9)
0.250 (6.4)
0.225 (5.7)
0.125 (3.2)