Development of a cloud chamber for observing the track of radiation

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Radiation has been described in the new course of study for lower secondary schools in science, after a break of forty years. However, there are fairly few numbers of teaching materials used at any time in schools. For example, in order to use the cloud chamber can be made of simple materials for observing the track of radiation, teachers should prepare a coolant (e.g. dry ice). Thus, conventional materials for radiation education are not convenient. In this study, we have developed useful educational materials for teachers.