2010 年 9 巻 2 号 p. 141-146
A homemade style of air proportional counter was constructed for exercises on radiation for technical staffs that belonged to Graduate School of Engineering, Osaka University. The counter successfully detected alpha-rays from the same type of mantle that was used as a radiation source for a well-known educational experiment with a cloud chamber, which had been performed just before radiation exercises with the counter. Without any special instrument for radiation measurement, pulse signals from the counter were well analyzed with a digital oscilloscope and a personal computer that were widely used for various purposes. Although results and data on such homemade style of educational radiation experiments were rough, discussions on them among trainees were sufficiently effective in the promotion of their understanding of radiation and its measurement.