baby scar gamma radiography - ndt · pdf filewho we are conventional and advanced ndt and...
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DACON INSPECTION SERVICES
SCAR RADIOGRAPHY
SCAR and ‘Baby’ SCAR
GAMMA RADIOGRAPHY
Who we are
Conventional and
Advanced NDT and
Inspection Services
Oil and Gas, Refinery,
Petrochemical, Heavy
Industry, Mining
Over 400 personnel
including more than
300 inspectors
Thailand headquarters
with International
expertise since 1979
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Operational Excellence - Our Customers
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
SCAR
Small Controlled Area Radiography Two different SCAR systems
1. ‘Baby’ SCAR 989 Se 75, (Max 20 Curie) 2. SCAR 959M. 80 Ci of Se 75 or 15 Ci of Ir 192
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
• Se-75 working range of 5-30mm steel thickness
• Ir 192 working range of 10-50mm steel thickness
• Se-75 has a softer gamma ray spectrum (66-401 keV)
than Iridium-192 (295-612 keV)
• Se 75 = Half Life of 119.8 days, (120 days)
• Ir 192 = Half Life of 73.83 days. (74 days)
Approx 46 days difference
SCAR
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Baby SCAR Projector
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
SCAR Radiography
• Se75 is mid-thickness gamma radiography
• ‘Baby’ SCAR has a tungsten shield
• Weighs 7.5 kg
• ‘Encapsulated source’ NEVER leaves container
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Baby SCAR Projector
Baby SCAR container showing lock device and beam port.
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Octagonal Cross Section
Pellet shape improves Geometric Unsharpness
therefore better quality radiograph
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Octagonal Cross Section
Diagonal of the octagonal
pellet is 1.145 times pellet
diameter. Diagonal of cylinder
of the same diameter,
is 1.414 times its diameter.
The pellet geometry allows
source to be up to 23.5%
closer. This increases exposure
rate per Curie at the object.
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Projector Placement
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Shielding Projector
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Survey Safe Distance
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Record Measurement of Safe Zone
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Reduced Area of Safe Zone From Football Pitch Size to Centre Circle Or Less
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
Baby SCAR Radiography
Advantages of SCAR System
Safety Improvements - daylight working
No Downtime
Allows Continuous Construction Work
Schedules Maintained or Improved
On-line Radiography - Allows Instant Welder Performance Monitoring
‘Nucleonics’ Type instruments Not Affected
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
SCAR Summary
• SCAR + Baby SCAR is safe to use 24 hours a day - no need for specific
radiography windows.
• Cost efficient.
• The barriered area is always very small, plus collimation less than 10 m
diameter (SCAR).
• Safe area is easier to see & control.
• SCAR will rarely affect other work.
• Equipment fits most pipe geometries.
• SCAR can replace most conventional radiography when planned in
advance.
DACON INSPECTION SERVICES P E R F O R M A N C E Y O U C A N T R U S T
How Can We Help?
Contact
Tim Shaw
Chief Marketing Officer
Email : [email protected]
Mobile Phone : +66 (0) 89 245 9966
www.dacon-inspection.com