SCAR RADIOGRAPHY DACON INSPECTION SERVICES SCAR and ‘ Baby ’ SCAR GAMMA RADIOGRAPHY
Who we are Conventional and Oil and Gas, Refinery, Over 400 personnel Thailand headquarters Advanced NDT and Petrochemical, Heavy including more than with International Inspection Services Industry, Mining 300 inspectors expertise since 1979
SCAR S mall C ontrolled A rea 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 P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
SCAR • 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 P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
Baby SCAR Projector P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
SCAR Radiography • Se75 is mid-thickness gamma radiography • ‘Baby’ SCAR has a tungsten shield • Weighs 7.5 kg • ‘Encapsulated source’ NEVER leaves container P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
Baby SCAR Projector Baby SCAR container showing lock device and beam port . P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
Octagonal Cross Section Pellet shape improves Geometric Unsharpness therefore better quality radiograph P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
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. P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
Projector Placement P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
Shielding Projector P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
Survey Safe Distance P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
Record Measurement of Safe Zone P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
Reduced Area of Safe Zone From Football Pitch Size to Centre Circle Or Less P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
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 P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
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. P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
How Can We Help ? Contact Tim Shaw Chief Marketing Officer Email : info@dacon-inspection.com Mobile Phone : +66 (0) 89 245 9966 www.dacon-inspection.com P E R F O R M A N C E YO U C A N T R U S T DACON INSPECTION SERVICES
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