SIGMA 150Ci - Manual (Page 6)

TECHNICAL SPECIFICATIONS
1.2
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
2.71g/cm 3 through 8.53g/cm 3 . 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 18.7g/cm 3 .
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 77C43515 to comply with the IAEA and USDOT requirements for
‘Special Form’ radioactive material. The ISO/ANSI classification 77C43515 stated in this manual
refers to the complete source assembly. The inner capsule (excluding X.540N) has been tested to
ISO/ANSI 77C64515 and therefore meets all the requirements of the IAEA Transport Regulations.
The sealed source is swaged to one end of a source holder consisting of a short flexible steel
cable which has the female half of a connector at the other end, used for coupling to a
control cable connector. The source assembly also has a stainless steel stop-ball swaged onto it
slightly forward from the source holder's 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 energy steel working maximum
number range thickness capacity
Ytterbium-169 918 8-308keV 32 days 2-20mm 20Ci 0.74TBq
Selenium-75 A424-25W 66-401keV 120 days 3-29mm 80Ci 3.00TBq
Iridium-192 A424-9 206-612keV 74 days 12-63mm 150Ci 5.55TBq
Cobalt-60 A424-19 1.17-1.33MeV 5.27 years 50-150mm 65mCi 2.40GBq
Model 880 Sigma authorized contents
Isotope
Assembly Gamma Half life Approximate Device/source
model energy steel working maximum
number range thickness capacity
Ytterbium-169 918 8-308keV 32 days 2-20mm 20Ci 0.74TBq
Selenium-75 A424-25W 66-401keV 120 days 3-29mm 80Ci 3.00TBq
Iridium-192 A424-9 206-612keV 74 days 12-63mm 130Ci 4.81TBq
Cobalt-60 A424-19 1.17-1.33MeV 5.27 years 50-150mm 25mCi 925MBq
Model 880 Elite authorized contents
Isotope
Assembly Gamma Half life Approximate Device/source
model energy steel working maximum
number range thickness capacity
Ytterbium-169 918 8-308keV 32 days 2-20mm 20Ci 0.74TBq
Selenium-75 A424-25W 66-401keV 120 days 3-29mm 80Ci 3.00TBq
Iridium-192 A424-9 206-612keV 74 days 12-63mm 50Ci 1.85TBq
Cobalt-60 A424-19 1.17-1.33MeV 5.27 years 50-150mm 25mCi 925MBq