Which material is commonly used for shielding against beta particles?

Plastic or acrylic is commonly used for shielding against beta particles due to its effective ability to absorb and stop these relatively low-energy particles. Beta particles, which are high-energy, high-speed electrons or positrons, can penetrate materials but are effectively shielded by lighter substances. Plastics, specifically those rich in hydrogen, have the right properties to slow down and capture beta particles, preventing them from passing through.

In applications where beta radiation is present, materials like lead are not ideal for shielding against beta particles because lead is better suited for gamma radiation and does not effectively stop beta particles. Steel offers similar limitations and is also more effective in shielding against gamma radiation rather than beta particles. While concrete can provide some shielding, it is generally more cumbersome for situations specifically requiring protection from beta radiation, where lighter materials like plastic or acrylic are both easier to handle and more efficient.

This is why plastic or acrylic is the preferred choice for shielding against beta particles, providing adequate protection while being lightweight and practical for various applications.