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Close Proximity Radiography

• What is Close Proximity Radiography?
• Stand-off Technique
• Procedures
• Applications
• Equipment
• People
• Advantages
• Limitations
• Summary
• What Next?

Overview

• Close Proximity Radiography allows radiographic inspection

surveys to be carried out adjacent to ongoing work scopes.

• This prevents the historical onsite disruption and the wide barrier

zones associated with scattered radiation.

What is Close Proximity Radiography?

• The equipment is fitted with a Collimated Head Unit which directs

the primary beam of radiation to a given point of inspection.

• This restricts any secondary radiation affecting the work site

What is Close Proximity Radiography?

Container Head Unit Primary Beam

• Additional shielding can be added to further reduce exposure to

the site if required Site example of the equipment being used for weld inspection

What is Close Proximity Radiography?

Container Collimator Head Unit

Pipe/inspection item Primary Beam Imaging Film

• When the container and pipe are not in direct contact with each
• ther, this is known as the “stand-off” technique
• This technique is predominantly used on ≤ 3 ½ “ pipework.
• There is more scattered radiation but the container can still be

used to limit and direct the beam of radiation

Stand-off Technique

Stand-off

Stand-off Site example

Procedures

The correct use of procedures and cooperation with associated governing bodies are paramount to safety and project success.

• TRAC Local Rules & Procedures
• HSE Notification
• Nuvia (RPA)
• SEPA

Applications

Weld Inspection Utilising either Digital or Darkroom imaging, close proximity radiography techniques and equipment offer the ideal solution for minimal site area restrictions and are predominately used on ≥ 4” pipework Corrosion Monitoring Flexible Riser Inspection

Equipment

TRAC use the Gilligan Engineering “VIKING” Close Proximity System

• Small and compact container
• Uses Selenium 75 or Iridium 192 radioactive sources
• Can also be adapted to use the guide tube for additional

techniques and applications

• All lead radiographers are qualified to PCN or ASNT standards and

are subject to TRAC competency and trade tests

• All assistant radiographers receive inductions and awareness

training followed up with on-site training

• All radiography personnel are required to attend an annual

medical, and their exposure to any radiation is monitored and logged

Personnel

Advantages

• The main advantage over other techniques is the safe working

distance and fewer restrictions to neighbouring activities

• This can be achieved by combining the correct source for the

work scope and additional shielding or controls

• As above, using this technique could have a maximum working area of only 3 meters
• As below, using other equipment and techniques usually requires a minimum of 10 meters

Limitations

• The container and head assembly are made from solid
• tungsten. Whilst this offers excellent shielding properties,

tungsten is heavy and this must be considered when setting up the unit prior to work starting

• On some applications (tight spaces/access), the Flexible

Guide Tube and Small Collimator has to be used (pictured on the right)

Close Proximity Radiography reduces the controlled area of work, creating a safer environment for the technicians and other personnel

• n board, with a range of different applications, this technique offers

the client more options when planning work scopes. TRAC are proud offer this solution in addition to our Techops radiography equipment. This equipment complements our ongoing commitment to the industry and embraces the latest technologies and best working practices. Other equipment solutions are on the market and can be supplied by TRAC for bespoke applications and requests.

Summary

• Any Questions?
• Any Upcoming Work Scopes?
• Any Other Issues/Challenges?

What Next?