Dacon Inspection Services recently acquired Small Controlled Area Radiography (SCAR) Radiographic Testing (RT) systems, which allow low radiation RT work to be conducted alongside normal work at construction sites. With conventional Gamma Ray sources, work sites usually require evacuation of all personnel, due to the high radiation – which usually means RT operations can only be conducted at lunchtime or at night. Now, with the advent of better radiation source holders, the radioactive source never leaves it’s container and the container is what shields people from receiving high doses of radiation.
The picture below shows an older method of exposing the source from its container to the exposure point. The source in transit indicates the danger of radioactive sources. In its container it is quite safe, and at the exposure point it can be shielded. Transit gives off high flash doses. The SCAR family (SCAR and “Baby” SCAR) has set a precedent for safer working in the industry and has enabled radiography to be carried out with radiation levels ALARP (As Low As Reasonably Practicable). The SCAR system is capable of performing radiography inside a controlled area in the workplace with limited disruption to normal operations. Reduction of unwanted radiation scattering effects around the film by effective photoelectric absorption has an additional benefit of improving radiograph quality.
Engineered Safety Features – 989 “Baby” SCAR