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 2.71g/cm3 through 8.53g/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 18.7g/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 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

1.2