SIGMA projetor - 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 2.71 g/cm
3
through 8.53
g/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 18.7 g/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
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
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 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
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 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