TECHNICAL SPECIFICATIONS
Applications
The Model 880 devices are used for industrial applications of gamma radiography, mainly with Iridium- 192, to inspect materials and structures in the density range of approximately 2.71 g/cm3 through 8.53 g/cm3. The Model 880 devices also accommodate low energy isotopes to permit radiography of materials and structures of thin sections of steel and low-density alloys. The Model 880 exposure devices are also designed for use with low activity sources with high photon energies that are used for mass absorption (gamma scanning) studies of high-density materials up to 18.7 g/cm3.
Standard Source Assembly
Metallic Iridium-192 discs and pellets are doubly encapsulated in welded stainless steel or titanium capsules. The sealed sources are designed and tested to achieve an ISO/ANSI minimum classification of 97C63515 and to comply with the IAEA and USDOT requirements for ‘Special Form’ radioactive material. The ISO/ANSI classification 97C63515 stated in this manual refers to the complete source capsule which is attached to the source assembly. This classification also applies to the Se-75, Co-60 and Cs-137 versions of the source assemblies. The Yb-169 sealed sources are designed and tested to achieve an ISO/ANSI minimum classification of 97C63535 and to comply with the IAEA and USDOT requirements for ‘Special Form’ radioactive material.
The sealed source is swaged to one end of a source holder consisting of a short flexible steel cable which has a female half of a connector at the other end, used for coupling to a control cable connector. The female connector also incorporates a stainless steel stop-ball swaged onto it (older versions of this source wire had the stop-ball as a separate component from the female connector). The purpose of the stop-ball is to provide mechanical positioning of the source assembly within the exposure device’s shielding and to provide a means of securing the source assembly in the exposure device’s locking mechanism.
Model 880 Delta authorized contents
Isotope | Assembly | Gamma | Half Life | Approximate | Device/Source |
| Model Number | Energy Range | | Steel Working | Maximum |
| | | | Thickness | 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 | 150 Ci | 5.55 TBq |
Cobalt-60 | A424-19 | 1.17-1.33 MeV | 5.27 years | 50-150 mm | 65 mCi | 2.40 GBq |
Cesium-137 | A424-30 | 663 keV | 30 years | 12-63 mm | 380 mCi 14.0 GBq |
Model 880 Sigma authorized contents
Isotope | Assembly | Gamma | Half Life | Approximate | Device/Source |
| Model Number | Energy Range | | Steel Working | Maximum |
| | | | Thickness | 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 | 130 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 |
1.2
