How are alpha particles interacted with a sheet of paper?

Alpha particles are positively charged particles consisting of two protons and two neutrons. Due to their significant mass and charge, they interact strongly with matter. When alpha particles encounter a sheet of paper, they are unable to penetrate even a thin barrier because they are quickly absorbed.

The paper's structure provides numerous opportunities for the alpha particles to collide with atoms in the material, causing them to lose energy and their ability to continue traveling. This absorption of energy leads to the complete stop of the alpha particles, so they do not pass through the paper or reflect off it.

This characteristic of alpha particles demonstrates their limited range in materials and highlights the effectiveness of simple barriers, such as paper, in shielding against this type of radiation. Understanding these interactions is crucial in radiological safety practices, as it helps determine appropriate protective measures for handling sources that emit alpha radiation.