Beta radiation consists of high-energy electrons or positrons emitted by certain radioactive nuclei. Beta particles have a larger mass than gamma rays, so they can be stopped by materials with a higher density and atomic number.

Materials with a low atomic number, such as plastics or wood, are not effective at shielding against beta radiation because the beta particles can easily penetrate them. Materials with a high atomic number, such as lead, are more effective because they can absorb beta particles more effectively.

Therefore, you should not use materials with a low atomic number, such as plastics or wood, to shield against beta radiation.