Technical Considerations in Developing a Motion-Controlled Positioning System for Use in Radiation Experiments
In this work, we report the technical considerations involved in developing a motion-controlled positioning set-up using a stepper motor system. This purpose of this set-up is to move a rectangular lead frame shield, which houses a radionuclide and detector for scanning underground object scatterer for Compton scattered tomographic imaging. A stepper motor, IP (Ingress Protection) rated, IP 65, US-based National Electrical Manufacturing Association, NEMA 34, was selected to move about 60 kg lead frame housing a radionuclide source and detector. Findings show that this programmable logic controller, PLC based stepping motor system being developed for this motion-controlled positioning equipment will achieve precise 3-D scan of objects buried under the ground. Scattered photons from an object scatterer (whose image is desired) are received at the detector, D and the electron density distribution of the object is directly imaged by Compton scattering tomography, CST. The CST image reconstruction code to be used by this equipment has been developed and some phantom images obtained using this code is presented. By connecting the detector to a display computer, interfaced with the developed CST image reconstruction code, desired images of objects under the ground can be displayed on a computer screen.