セパレータを有する箔検電器の製作と診断用X線装置を用いた実験の提案

摘要

In order to use the practical training for beginners by means of a diagnostic X-ray, a leaf electroscope (which has a function to explain the ionization) was newly produced. The X-ray was introduced to the air in the electroscope having the electric charged leaf (the leaf was open at this time). The air irradiated by the X-ray was ionized, and then the produced ions or electrons were combined with charges on the leaf. As a result, the leaf was closed. In this way, experimenters can know the production and/or movement of charges by observing the conditions of the leaf. For the developed leaf electroscope, we added separators to divide the inner space into two regions; one is the irradiation area and the other is the space including the leaf. The separators have through-holes and/or a metallic mesh in order to create various conditions. In this paper, we described that different experimental results based on uses of the different separators were reflected in the ionization of the irradiated air and in the interaction of the charged particles. We summarized that the practical training by means of the developed leaf electroscope was valuable to educate beginners.%放射線と物質との相互作用を理解することは，診療放射線技師を志す初学者にとって非常に重要である.診療放射線技師の養成校で使用している教科書では，放射線の定義として電離作用を有することが冒頭で明確に述べられており，初学者における大学教育の出発点が電離作用の理解であることは自明である.学習を進めるにつれて，診療用X線の領域では光電効果やコンプトン散乱が主な相互作用であり，原子の構造や電気(素電荷)などのモデルを用いて電離作用を説明できることを知るが，高等学校の教育課程からの飛躍が大きいので，多くの初学者が理解に苦労している.