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概要

Abstract. A scientifically correct understanding of the nature of ionizing radiation and its impact on the health has become more and more important after the accident at the Fukushima nuclear ower plant due to the Great East Japan Earthquake that occurred on March 11, 2011. We have developed the diffusion cloud chamber with the function of insertion and extraction of both a radiat ion source and a shield material independently. We demonstrated the observation of the tracks of various shape generated by alpha and beta radiation source, the tracks of various length by var us energy of beta rays, and shielding effect, for those who are not familiar with radiation, with the similar cloud chamber. And we investigated the impression of the demonstration from them.

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