Diffusion Cloud Chamber - to observe the Invisible

Experimental education in nuclear physics at secondary schools is less common compared to the other disciplines of physics. The reason is mainly due to the shortagein appropriate devices of affordable prices. However, the phenomena of radioactivity, nuclear physics are fundamnetal in the general comprehension of microscopic behaviour of matter and many fields of important applications. In this paper we would like to show some simple examples of the utilization of a diffusion cloud chamber in education. These experiments and demonstrations may extend the students' thinking and enhance their interest in nuclear physic