[[abstract]]Concerning the environmental radioactivity education, a survey was carried out by means of questionnaires for 1,160 students from 16 to 19 ages. Answers of students expressed, the majority of students has somewhat negative images for environmental radioactivity because they has obtained the information about radioactivity through the mass communication rather than learning in school. A new teaching materials for learning environmental radioactivity by means of G-M counter has been developed through measurement of K-40 in tobacco ash, vegetables, fruits and air-borne particlates. From several trial and error, it was found that measurement of air-borne particulates radioactivity deposited on the surface of the teflon plate was suitable for secondary school. Teaching the concepts of permissible or acceptable level of radioactivity was included.
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