How are alpha particles typically blocked?

Alpha particles are a type of ionizing radiation that are relatively large and carry a positive charge. Due to their size and charge, they have low penetration power compared to other forms of radiation, such as beta particles or gamma rays. Alpha particles can be effectively stopped by very thin materials.

The correct method for blocking alpha particles is through the use of materials that can provide a barrier, such as paper, cardboard, or certain types of fabric. Fabric personal protective equipment (PPE) can act as a barrier to alpha radiation, primarily because it is dense enough to absorb the particles, effectively preventing them from reaching the skin or being inhaled.

In contrast, while metal shields are effective against beta and gamma radiation, they are not necessary for alpha particles. Plastic barriers and cardboard both could stop alpha particles, but fabric PPE is specifically mentioned as a practical application for first responders in the field, making it a relevant choice.

Overall, the importance of understanding how different materials interact with different types of radiation is crucial for ensuring safety in hazmat situations, and fabric PPE provides an easy-to-access solution for everyday exposure to alpha radiation.