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This paper describes the outline of the development of the colour sensor meant for the radiation-robot used for the alignment of sample for various experiments in a radiation environment near nuclear beam line of 3MV Tandem pelletron Accelerator at Institute of Physics, Bubaneswar. In this paper a comparative study between the APD and LDR for their sensitivity towards different colours also discussed. A cost effective as well as with reasonable accuracy and precision, a colour sensor is developed with a array of LDRs, where the biasing voltage is very less compared to APD based colour sensor. This sensor is used in a micro-controller based robotic arm and successfully able to distinguish 8 colors. This can be enhanced to 256 colors. This work is the first developmental stage of the robot, which will be used for alignment of the sample sensing laser of different colour in high-dose radiation environment (External …