People in Japan felt more anxious about radiation than before after huge amount of radioactive material leaked out on Great East Japan Earthquake in 2011. Teaching materials to understand properly the characteristics of radiation are developed in this research. Image processing technology is used to make more attractive for school students. Three teaching materials were developed. The first and second ones are programs, respectively, for understanding the permeability of radiation and a gaming

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... ype by using AR(Augmented Reality) technique. The third one is a program to count the number of flight paths of radiation in a cloud chamber by using OpenCV. These programs need to be improved more for the use in teaching and training in junior high and elementary schools.