Development of Spatial Dose Distribution measuring system of X-ray Beamline in Cargo container scanner using MV energy x-ray

Abstract

A cargo container scanner using X-ray generally inspects the interior of the container non-destructively using MV X-ray. Scanning system should be designed with a structure to minimize the leakage of X-ray dose. To do this, precise control of the incident direction and distribution of X-ray beam has to be performed. In order perform the control, precise alignment of the X-ray and image detector should be performed and accurate collimation of the X-ray beam should be performed. And the X-ray beam distribution by position must be accurately measured. In order to measure the x-ray spatial dose distribution, methods using ion chambers, diodes, plastic scintillators, etc. can be used. Among these methods, the method using diode is difficult to measure the dose accurately compared to the ion chamber, but it has a merit that the size of the pixel can be made relatively small, the manufacturing cost is low, and the maintenance is simple. For this reason, a dose measuring device using a diode is widely used for measuring the dose. So, we have developed the spatial dose distribution measuring system to measure the spatial dose distribution of cargo container scanner. The experimental evaluation of the developed X-ray spatial dose distribution measuring device was carried out in the cargo container scanner test bed developed by KRISO (Korea Research Institute of Ship and Ocean Engineering). Experiments were carried out on the