Development of a fourth generation industrial tomography for multiphase systems analysis

In the present work a 4D (three dimensions combined with the time) fourth generation CT system was developed with several detectors (as much as required) made with CsI (Tl) size of 5 mm × 20 mm width × length) coupled to PIN photodiodes size of 5 × 5 mm². It was also developed a pulse sensitive preamplifier in a small electronic circuit board with size of 9.5 × 100 mm² (width × length). This system was able to identify 80 keV photopeak at room temperature and was obtained a photo peak counting efficiency around 33% for ¹³⁷Cs. The proposed CT was assembled on a wooden platform, where the cylindrical detectors (photodiode + preamplifier + CsI (Tl) crystal) are arranged in pentagonal parallel or fan sectors. Five sources of ¹³⁷Cs or jointly with ¹³³Ba or ¹⁹²Ir are assembled at the vertices. Each detector was supplied with three power supplies: +12V,-12V and adjustable high voltage HV (capable to range from 0 to 2000V). The pre-amplifier signal was connected to a data acquisition unit containing amplifier, counter unit and transfer data via USB-2 cable to a computer type PC-Windows. The system was easily adaptable to the environment of the industries and able to produce multi-phase analysis in real time.