What is the most penetrating kind of radiation product that can be shielded with aluminum foil?

Beta particles are more penetrating than alpha particles, which can be stopped by paper or skin, but beta particles can be stopped by a thin sheet of aluminum. Gamma rays and high-energy photons are more penetrating and generally require dense shielding, such as lead or concrete. Therefore, beta particles are the most penetrating choice that aluminum foil can shield.

AI-written and checked against the verified answer.