Which statement best describes shielding against alpha particles?

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Multiple Choice

Which statement best describes shielding against alpha particles?

Explanation:
Alpha particles are heavy, positively charged and interact strongly with matter, so they lose energy quickly and have only a very short range. A thin barrier like a sheet of paper—or even the outer layer of skin—is enough to stop them, which is why paper or skin best describes shielding against alpha radiation. Dense shields such as lead or concrete aren’t needed for externally incident alpha particles, though shielding inside the body isn’t relevant here; the real safety concern is preventing inhalation or ingestion of alpha-emitting material.

Alpha particles are heavy, positively charged and interact strongly with matter, so they lose energy quickly and have only a very short range. A thin barrier like a sheet of paper—or even the outer layer of skin—is enough to stop them, which is why paper or skin best describes shielding against alpha radiation. Dense shields such as lead or concrete aren’t needed for externally incident alpha particles, though shielding inside the body isn’t relevant here; the real safety concern is preventing inhalation or ingestion of alpha-emitting material.

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