Emissions from alpha decay require the least amount of shielding. Which best describes why the emissions from alpha decay are so easily blocked compared to the emissions of other types of radioactive decay?

Alpha particles are helium nuclei, with two protons and two neutrons, so they have more mass and charge than the electrons or positrons released in beta decay. Their larger mass and charge make them interact strongly with matter and lose energy quickly, so a small amount of shielding can stop them. Choice B gives the correct comparison.

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