Gamma-Ray Tomograph

A non-destructive, non-interfering tool for dynamic measurement of three-component/multiphase flow in a pipe.

Gamma-Ray Tomograph

Originally developed by Geir Anton Johansen and Bjørn Tore Hjertaker at the University of Bergen, the tool functions through the use of five radioactive sources and detectors oriented around the circumference of a 4in pipe. Radiation is emitted from the radionuclide AM-241 sources and travels through the pipe and out the other side until it is absorbed by the detectors. Due to density changes in the multiphase or multicomponent flow at a given time, varying amounts of radiation are able to pass through the fluid. Some of the radiation will be attenuated by the more dense components and not reach the detectors. The detectors can thus register where the more and less dense regions are located in the pipe. A single detector registers a 2D image of the pipe, but with the use of 5 circumferentially oriented, a circular image can be recreated to more accurately represent the fluid. The temporal resolution can be optimized based on the fluid properties and flow rate with a range between 100 and 1000 Hz.

Prototech was heavily involved in the project from the start to finish and operated as the main contractor. The concept, specifications and operating conditions were determined in collaboration with the University of Bergen to suit the customer’s requirements and adhere to international standards. Design and manufacturing of the source containers including radiation-shielding requirements, testing, and approval with international regulatory agencies was performed by Prototech with support from Tracerco. The tomographer structure was also designed and manufactured by Prototech again based on radiation attenuation requirements but also on subcontractor specifications. Subcontractor IDE AS was responsible for designing the detectors and electronics while CMR developed the software and user interface together with the University of Bergen.

Completion and closure of the project is H1 2016.



Simplified demonstration video



  • Period

    2015 - 2016

  • Client

    Saskatchewan Research Council

  • Country