SIGMA projetor - Manual (Page 7)

TECHNICAL SPECIFICATIONS
1.3
Model 880 Elite authorized contents
Isotope Assembly
Model Number
Gamma
Energy Range Half Life Approximate
Steel Working
Thickness Device/Source
Maximum
Capacity
Ytterbium-169 91810 8-308 keV 32 days 2-20 mm 20 Ci 0.74 TBq
Selenium-75 A424-25W 66-401 keV 120 days 3-29 mm 150 Ci 5.55 TBq
Iridium-192 A424-9 206-612 keV 74 days 12-63 mm 50 Ci 4.81 TBq
Cobalt-60 A424-19 1.17-1.33 MeV 5.27 years 50-150 mm 25 mCi 925 MBq
Cesium-137 A424-30 663 keV 30 years 12-63 mm 380 mCi 14.0 GBq
Model 880 Omega authorized contents
Isotope Assembly
Model Number
Gamma
Energy Range Half Life Approximate
Steel Working
Thickness Device/Source
Maximum
Capacity
Ytterbium-169 91810 8-308 keV 32 days 2-20 mm 30 Ci 1.11 TBq
Selenium-75 A424-25W 66-401 keV 120 days 3-29 mm 80 Ci 2.96 TBq
Iridium-192 A424-9 206-612 keV 74 days 12-63 mm 15 Ci 0.55 TBq
Source output
Isotope At 1 m per Ci (37 GBq) At 1 ft per Ci (37 GBq)
Ytterbium-169 0.125 R/hr 1.25 mSv/hr 1.3 R/hr 13.0 mSv/hr
Selenium-75 0.203 R/hr 2.03 mSv/hr 2.2 R/hr 22.0 mSv/hr
Iridium-192 0.48 R/hr 4.80 mSv/hr 5.2 R/hr 52.0 mSv/hr
Cobalt-60 1.30 R/hr 13.0 mSv/hr 14.0 R/hr 140 mSv/hr
Cesium-137 0.32 R/hr 3.20 mSv/hr 3.4 R/hr 34.0 mSv/hr
Selected attenuation data
Approximate Half Value Thickness
Inches (mm)
Material Approximate
Material
Density
(g/cm
3
)
Ytterbium-169 Selenium-75 Iridium-192 Cobalt-60 Cesium-137
Concrete 2.35 1.140 (29.0) 1.180 (30.0) 1.700 (43.2) 2.400 (61.0) 3.00 (76.2)
Aluminum 2.65 - 1.100 (27.0) - - -
Steel 7.80 0.170 (4.3) 0.315 (8.0) 0.512 (13.0) 0.827 (21.0) 0.900 (22.9)
Lead 11.34 0.032 (0.8) 0.039 (1.0) 0.200 (5.1) 0.500 (12.7) 0.250 (6.4)
Tungsten 17.80 - 0.032 (0.8) 0.130 (3.3) 0.310 (7.9) 0.225 (5.7)
DU 18.70 - - 0.050 (1.3) 0.270 (6.8) 0.125 (3.2)
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)