What are some shielding materials adequate for protection from alpha particles?

When it comes to radiation types, alpha particles are the easiest to shield against.

With two neutrons and two protons, and a 2+ charge, the particles are very large in terms of atoms; as a result, they interact with materials extensively and lose energy over very short distances.

The maximum alpha particle travel in air is 5 cm. Most materials have a very high stopping power; a piece of paper or a few millimeters of water are typically sufficient to stop alpha particles. Alpha particles even don't penetrate beyond the epidermis.

Keep in mind that a material's limited range does not imply a decrease in energy; rather, it simply indicates that the energy is deposited over a very small area, making them highly dangerous, for example, if consumed or inhaled!

Common shielding materials for alpha particles include paper, cardboard, clothing, and human skin. However, more dense materials like plastic, glass, or metals, such as aluminum or lead, provide enhanced protection.