Industrial tomography using three different gamma ray

• Multiphase multisource tomography using a 3th generation scan was described.
• The use of a set of fast multichannel analyzers was evaluated.
• A discussion of the images obtained from a tomography with different energies was reported.
• Holdup analysis inside a bubble column is discussed.
• A statistical analysis to compare the performance from tomography images is presented.

This study describes the development of a multisource computed tomography (CT) system that proved to be a useful tool to study multiphase systems. In this CT system, two different radioisotope sources, 192Ir (317 keV and 448 keV) and 137Cs (662 keV), were placed in a single lead collimator and several tomography measurements carried out. The multisource CT system was capable of determining as well as differentiating the attenuation coefficients of materials with two phases (gas and liquid). It was also able to provide important information concerning the hydrodynamics occurring inside a multiphase column.